53 results on '"María Rupérez"'
Search Results
2. Reduced Placental Transfer of Antibodies Against a Wide Range of Microbial and Vaccine Antigens in HIV-Infected Women in Mozambique
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Selena Alonso, Marta Vidal, Gemma Ruiz-Olalla, Raquel González, M. Nelia Manaca, Chenjerai Jairoce, Miquel Vázquez-Santiago, Reyes Balcells, Anifa Vala, María Rupérez, Pau Cisteró, Laura Fuente-Soro, Marta Cova, Evelina Angov, Arsenio Nhacolo, Esperança Sevene, John J. Aponte, Eusebio Macete, Ruth Aguilar, Alfredo Mayor, Clara Menéndez, Carlota Dobaño, and Gemma Moncunill
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antibody ,maternal antibodies ,placental transfer ,HIV ,pathogens ,malaria ,Immunologic diseases. Allergy ,RC581-607 - Abstract
Transplacental transfer of antibodies is essential for conferring protection in newborns against infectious diseases. We assessed the impact of different factors, including gestational age and maternal infections such as HIV and malaria, on the efficiency of cord blood levels and placental transfer of IgG subclasses. We measured total IgG and IgG subclasses by quantitative suspension array technology against 14 pathogens and vaccine antigens, including targets of maternal immunization, in 341 delivering HIV-uninfected and HIV-infected mother-infant pairs from southern Mozambique. We analyzed the association of maternal HIV infection, Plasmodium falciparum exposure, maternal variables and pregnancy outcomes on cord antibody levels and transplacental transfer. Our results show that maternal antibody levels were the main determinant of cord antibody levels. Univariable and multivariable analysis showed that HIV reduced the placental transfer and cord levels of IgG and IgG1 principally, but also IgG2 to half of the antigens tested. P. falciparum exposure and prematurity were negatively associated with cord antibody levels and placental transfer, but this was antigen-subclass dependent. Our findings suggest that lower maternally transferred antibodies may underlie increased susceptibility to infections of HIV-exposed infants. This could affect efficacy of maternal vaccination, especially in sub-Saharan Africa, where there is a high prevalence of HIV, malaria and unfavorable environmental factors.
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- 2021
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3. Association of Maternal Factors and HIV Infection With Innate Cytokine Responses of Delivering Mothers and Newborns in Mozambique
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Gemma Moncunill, Carlota Dobaño, Raquel González, Kinga K. Smolen, Maria N. Manaca, Reyes Balcells, Chenjerai Jairoce, Pau Cisteró, Anifa Vala, Esperança Sevene, María Rupérez, John J. Aponte, Eusébio Macete, Clara Menéndez, Tobias R. Kollmann, and Alfredo Mayor
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cytokines ,pattern recognition receptors ,innate immunity ,cord ,pregnant women ,anemia ,Microbiology ,QR1-502 - Abstract
Maternal factors and exposure to pathogens have an impact on infant health. For instance, HIV exposed but uninfected infants have higher morbidity and mortality than HIV unexposed infants. Innate responses are the first line of defense and orchestrate the subsequent adaptive immune response and are especially relevant in newborns. To determine the association of maternal HIV infection with maternal and newborn innate immunity we analyzed the cytokine responses upon pattern recognition receptor (PRR) stimulations in the triad of maternal peripheral and placental blood as well as in cord blood in a cohort of mother-infant pairs from southern Mozambique. A total of 48 women (35 HIV-uninfected and 13 HIV-infected) were included. Women and infant innate responses positively correlated with each other. Age, gravidity and sex of the fetus had some associations with spontaneous production of cytokines in the maternal peripheral blood. HIV-infected women not receiving antiretroviral therapy (ART) before pregnancy showed decreased IL-8 and IL-6 PRR responses in peripheral blood compared to those HIV-uninfected, and PRR hyporesponsiveness for IL-8 was also found in the corresponding infant’s cord blood. HIV infection had a greater impact on placental blood responses, with significantly increased pro-inflammatory, TH1 and TH17 PRR responses in HIV-infected women not receiving ART before pregnancy compared to HIV-uninfected women. In conclusion, innate response of the mother and her newborn was altered by HIV infection in the women who did not receive ART before pregnancy. As these responses could be related to birth outcomes, targeted innate immune modulation could improve maternal and newborn health.
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- 2020
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4. Resisting and tolerating P. falciparum in pregnancy under different malaria transmission intensities
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Nicaise Tuikue Ndam, Emmanuel Mbuba, Raquel González, Pau Cisteró, Simon Kariuki, Esperança Sevene, María Rupérez, Ana Maria Fonseca, Anifa Vala, Sonia Maculuve, Alfons Jiménez, Llorenç Quintó, Peter Ouma, Michael Ramharter, John J. Aponte, Arsenio Nhacolo, Achille Massougbodji, Valerie Briand, Peter G. Kremsner, Ghyslain Mombo-Ngoma, Meghna Desai, Eusebio Macete, Michel Cot, Clara Menéndez, and Alfredo Mayor
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Malaria ,Pregnancy ,Immunity ,Resistance ,Tolerance ,Medicine - Abstract
Abstract Background Resistance and tolerance to Plasmodium falciparum can determine the progression of malaria disease. However, quantitative evidence of tolerance is still limited. We investigated variations in the adverse impact of P. falciparum infections among African pregnant women under different intensities of malaria transmission. Methods P. falciparum at delivery was assessed by microscopy, quantitative PCR (qPCR) and placental histology in 946 HIV-uninfected and 768 HIV-infected pregnant women from Benin, Gabon, Kenya and Mozambique. Resistance was defined by the proportion of submicroscopic infections and the levels of anti-parasite antibodies quantified by Luminex, and tolerance by the relationship of pregnancy outcomes with parasite densities at delivery. Results P. falciparum prevalence by qPCR in peripheral and/or placental blood of HIV-uninfected Mozambican, Gabonese and Beninese women at delivery was 6% (21/340), 11% (28/257) and 41% (143/349), respectively. The proportion of peripheral submicroscopic infections was higher in Benin (83%) than in Mozambique (60%) and Gabon (55%; P = 0.033). Past or chronic placental P. falciparum infection was associated with an increased risk of preterm birth in Mozambican newborns (OR = 7.05, 95% CI 1.79 to 27.82). Microscopic infections were associated with reductions in haemoglobin levels at delivery among Mozambican women (–1.17 g/dL, 95% CI –2.09 to –0.24) as well as with larger drops in haemoglobin levels from recruitment to delivery in Mozambican (–1.66 g/dL, 95% CI –2.68 to –0.64) and Gabonese (–0.91 g/dL, 95% CI –1.79 to –0.02) women. Doubling qPCR-peripheral parasite densities in Mozambican women were associated with decreases in haemoglobin levels at delivery (–0.16 g/dL, 95% CI –0.29 to –0.02) and increases in the drop of haemoglobin levels (–0.29 g/dL, 95% CI –0.44 to –0.14). Beninese women had higher anti-parasite IgGs than Mozambican women (P
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- 2017
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5. HIV drug resistance patterns in pregnant women using next generation sequence in Mozambique.
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María Rupérez, Marc Noguera-Julian, Raquel González, Sonia Maculuve, Rocío Bellido, Anifa Vala, Cristina Rodríguez, Esperança Sevene, Roger Paredes, and Clara Menéndez
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Medicine ,Science - Abstract
Few data on HIV resistance in pregnancy are available from Mozambique, one of the countries with the highest HIV toll worldwide. Understanding the patterns of HIV drug resistance in pregnant women might help in tailoring optimal regimens for prevention of mother to child transmission of HIV (pMTCT) and antenatal care.To describe the frequency and characteristics of HIV drug resistance mutations (HIVDRM) in pregnant women with virological failure at delivery, despite pMTCT or antiretroviral therapy (ART).Samples from HIV-infected pregnant women from a rural area in southern Mozambique were analysed. Only women with HIV-1 RNA >400c/mL at delivery were included in the analysis. HIVDRM were determined using MiSeq® (detection threshold 1%) at the first antenatal care (ANC) visit and at the time of delivery.Ninety and 60 samples were available at the first ANC visit and delivery, respectively. At first ANC, 97% of the women had HIV-1 RNA>400c/mL, 39% had CD4+ counts
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- 2018
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6. Effects of HIV infection on maternal and neonatal health in southern Mozambique: A prospective cohort study after a decade of antiretroviral drugs roll out.
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Raquel González, María Rupérez, Esperança Sevene, Anifa Vala, Sónia Maculuve, Helder Bulo, Arsénio Nhacolo, Alfredo Mayor, John J Aponte, Eusébio Macete, and Clara Menendez
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Medicine ,Science - Abstract
The HIV epidemic is concentrated in sub-Saharan Africa. However, limited information exists on its impact on women and infant's health since the introduction of antiretroviral drugs in this region, where health resources are often scarce.The effect of HIV infection on maternal health, birth outcomes and infant health was analysed in two contemporary cohorts of HIV-uninfected and HIV-infected pregnant women from southern Mozambique. Pregnant women attending the first antenatal care visit were followed until one month after delivery. Antiretroviral therapy was administered based on CD4+T cell count and clinical stage. Maternal and neonatal morbidity and mortality, as well as pregnancy outcomes were assessed by mother's HIV status.A total of 1183 HIV-uninfected and 561 HIV-infected pregnant women were enrolled. HIV-infected women were more likely to have anaemia both at the first antenatal care visit and at delivery than HIV-uninfected women (71.5% versus 54.8% and 49.4% versus 40.6%, respectively, p
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- 2017
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7. Infant mortality and morbidity associated with preterm and small-for-gestational-age births in Southern Mozambique: A retrospective cohort study.
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Alberto L García-Basteiro, Llorenç Quintó, Eusebio Macete, Azucena Bardají, Raquel González, Arsenio Nhacolo, Betuel Sigauque, Charfudin Sacoor, María Rupérez, Elisa Sicuri, Quique Bassat, Esperança Sevene, and Clara Menéndez
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Medicine ,Science - Abstract
BACKGROUND:Preterm and small for gestational age (SGA) births have been associated with adverse outcomes during the first stages of life. We evaluated the morbidity and mortality associated with preterm and SGA births during the first year of life in a rural area of Southern Mozambique. METHODS:This is a retrospective cohort study using previously collected data from children born at the Manhiça District Hospital in two different periods (2003-2005 and 2010-2012). Newborns were classified as being preterm and/or SGA or as babies not fulfilling any of the previous conditions (term non-SGA). All children were followed up for a year for morbidity and mortality outcomes. RESULTS:A total of 5574 live babies were included in the analysis. The prevalence of preterm delivery was 6.2% (345/5574); the prevalence of SGA was 14.0% (776/5542) and 2.2% (114/5542) of the children presented both conditions. During the neonatal period, preterm delivery and SGA were associated with 13 (HR: 13.0, 95% CI 4.0-42.2) and 5 times (HR: 4.5, 95% CI: 1.6-12.6) higher mortality compared to term non SGA babies. Risk of hospitalization was only increased when both conditions were present (IRR: 3.5, 95%CI: 1.5-8.1). Mortality is also increased during the entire first year, although at a lower rate. CONCLUSIONS:Neonatal and infant mortality rates are remarkably high among preterm and SGA babies in southern Mozambique. These increased rates are concentrated within the neonatal period. Prompt identification of these conditions is needed to implement interventions aimed at increasing survival of these high-risk newborns.
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- 2017
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8. Mortality, Morbidity, and Developmental Outcomes in Infants Born to Women Who Received Either Mefloquine or Sulfadoxine-Pyrimethamine as Intermittent Preventive Treatment of Malaria in Pregnancy: A Cohort Study.
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María Rupérez, Raquel González, Ghyslain Mombo-Ngoma, Abdunoor M Kabanywanyi, Esperança Sevene, Smaïla Ouédraogo, Mwaka A Kakolwa, Anifa Vala, Manfred Accrombessi, Valérie Briand, John J Aponte, Rella Manego Zoleko, Ayôla A Adegnika, Michel Cot, Peter G Kremsner, Achille Massougbodji, Salim Abdulla, Michael Ramharter, Eusébio Macete, and Clara Menéndez
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Medicine - Abstract
BackgroundLittle is known about the effects of intermittent preventive treatment of malaria in pregnancy (IPTp) on the health of sub-Saharan African infants. We have evaluated the safety of IPTp with mefloquine (MQ) compared to sulfadoxine-pyrimethamine (SP) for important infant health and developmental outcomes.Methods and findingsIn the context of a multicenter randomized controlled trial evaluating the safety and efficacy of IPTp with MQ compared to SP in pregnancy carried out in four sub-Saharan countries (Mozambique, Benin, Gabon, and Tanzania), 4,247 newborns, 2,815 born to women who received MQ and 1,432 born to women who received SP for IPTp, were followed up until 12 mo of age. Anthropometric parameters and psychomotor development were assessed at 1, 9, and 12 mo of age, and the incidence of malaria, anemia, hospital admissions, outpatient visits, and mortality were determined until 12 mo of age. No significant differences were found in the proportion of infants with stunting, underweight, wasting, and severe acute malnutrition at 1, 9, and 12 mo of age between infants born to women who were on IPTp with MQ versus SP. Except for three items evaluated at 9 mo of age, no significant differences were observed in the psychomotor development milestones assessed. Incidence of malaria, anemia, hospital admissions, outpatient visits, and mortality were similar between the two groups. Information on the outcomes at 12 mo of age was unavailable in 26% of the infants, 761 (27%) from the MQ group and 377 (26%) from the SP group. Reasons for not completing the study were death (4% of total study population), study withdrawal (6%), migration (8%), and loss to follow-up (9%).ConclusionsNo significant differences were found between IPTp with MQ and SP administered in pregnancy on infant mortality, morbidity, and nutritional outcomes. The poorer performance on certain psychomotor development milestones at 9 mo of age in children born to women in the MQ group compared to those in the SP group may deserve further studies.Trial registrationClinicalTrials.gov NCT00811421.
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- 2016
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9. Intermittent preventive treatment of malaria in pregnancy with mefloquine in HIV-negative women: a multicentre randomized controlled trial.
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Raquel González, Ghyslain Mombo-Ngoma, Smaïla Ouédraogo, Mwaka A Kakolwa, Salim Abdulla, Manfred Accrombessi, John J Aponte, Daisy Akerey-Diop, Arti Basra, Valérie Briand, Meskure Capan, Michel Cot, Abdunoor M Kabanywanyi, Christian Kleine, Peter G Kremsner, Eusebio Macete, Jean-Rodolphe Mackanga, Achille Massougbodgi, Alfredo Mayor, Arsenio Nhacolo, Golbahar Pahlavan, Michael Ramharter, María Rupérez, Esperança Sevene, Anifa Vala, Rella Zoleko-Manego, and Clara Menéndez
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Medicine - Abstract
BackgroundIntermittent preventive treatment in pregnancy (IPTp) with sulfadoxine-pyrimethamine (SP) is recommended by WHO to prevent malaria in African pregnant women. The spread of SP parasite resistance has raised concerns regarding long-term use for IPT. Mefloquine (MQ) is the most promising of available alternatives to SP based on safety profile, long half-life, and high efficacy in Africa. We evaluated the safety and efficacy of MQ for IPTp compared to those of SP in HIV-negative women.Methods and findingsA total of 4,749 pregnant women were enrolled in an open-label randomized clinical trial conducted in Benin, Gabon, Mozambique, and Tanzania comparing two-dose MQ or SP for IPTp and MQ tolerability of two different regimens. The study arms were: (1) SP, (2) single dose MQ (15 mg/kg), and (3) split-dose MQ in the context of long lasting insecticide treated nets. There was no difference on low birth weight prevalence (primary study outcome) between groups (360/2,778 [13.0%]) for MQ group and 177/1,398 (12.7%) for SP group; risk ratio [RR], 1.02 (95% CI 0.86-1.22; p=0.80 in the ITT analysis). Women receiving MQ had reduced risks of parasitemia (63/1,372 [4.6%] in the SP group and 88/2,737 [3.2%] in the MQ group; RR, 0.70 [95% CI 0.51-0.96]; p=0.03) and anemia at delivery (609/1,380 [44.1%] in the SP group and 1,110/2743 [40.5%] in the MQ group; RR, 0.92 [95% CI 0.85-0.99]; p=0.03), and reduced incidence of clinical malaria (96/551.8 malaria episodes person/year [PYAR] in the SP group and 130/1,103.2 episodes PYAR in the MQ group; RR, 0.67 [95% CI 0.52-0.88]; p=0.004) and all-cause outpatient attendances during pregnancy (850/557.8 outpatients visits PYAR in the SP group and 1,480/1,110.1 visits PYAR in the MQ group; RR, 0.86 [0.78-0.95]; p=0.003). There were no differences in the prevalence of placental infection and adverse pregnancy outcomes between groups. Tolerability was poorer in the two MQ groups compared to SP. The most frequently reported related adverse events were dizziness (ranging from 33.9% to 35.5% after dose 1; and 16.0% to 20.8% after dose 2) and vomiting (30.2% to 31.7%, after dose 1 and 15.3% to 17.4% after dose 2) with similar proportions in the full and split MQ arms. The open-label design is a limitation of the study that affects mainly the safety assessment.ConclusionsWomen taking MQ IPTp (15 mg/kg) in the context of long lasting insecticide treated nets had similar prevalence rates of low birth weight as those taking SP IPTp. MQ recipients had less clinical malaria than SP recipients, and the pregnancy outcomes and safety profile were similar. MQ had poorer tolerability even when splitting the dose over two days. These results do not support a change in the current IPTp policy.Trial registrationClinicalTrials.gov NCT 00811421; Pan African Clinical Trials Registry PACTR 2010020001429343 Please see later in the article for the Editors' Summary.
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- 2014
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10. Intermittent preventive treatment of malaria in pregnancy with mefloquine in HIV-infected women receiving cotrimoxazole prophylaxis: a multicenter randomized placebo-controlled trial.
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Raquel González, Meghna Desai, Eusebio Macete, Peter Ouma, Mwaka A Kakolwa, Salim Abdulla, John J Aponte, Helder Bulo, Abdunoor M Kabanywanyi, Abraham Katana, Sonia Maculuve, Alfredo Mayor, Arsenio Nhacolo, Kephas Otieno, Golbahar Pahlavan, María Rupérez, Esperança Sevene, Laurence Slutsker, Anifa Vala, John Williamsom, and Clara Menéndez
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Medicine - Abstract
BACKGROUND: Intermittent preventive treatment in pregnancy (IPTp) with sulfadoxine-pyrimethamine (SP) is recommended for malaria prevention in HIV-negative pregnant women, but it is contraindicated in HIV-infected women taking daily cotrimoxazole prophylaxis (CTXp) because of potential added risk of adverse effects associated with taking two antifolate drugs simultaneously. We studied the safety and efficacy of mefloquine (MQ) in women receiving CTXp and long-lasting insecticide treated nets (LLITNs). METHODS AND FINDINGS: A total of 1,071 HIV-infected women from Kenya, Mozambique, and Tanzania were randomized to receive either three doses of IPTp-MQ (15 mg/kg) or placebo given at least one month apart; all received CTXp and a LLITN. IPTp-MQ was associated with reduced rates of maternal parasitemia (risk ratio [RR], 0.47 [95% CI 0.27-0.82]; p=0.008), placental malaria (RR, 0.52 [95% CI 0.29-0.90]; p=0.021), and reduced incidence of non-obstetric hospital admissions (RR, 0.59 [95% CI 0.37-0.95]; p=0.031) in the intention to treat (ITT) analysis. There were no differences in the prevalence of adverse pregnancy outcomes between groups. Drug tolerability was poorer in the MQ group compared to the control group (29.6% referred dizziness and 23.9% vomiting after the first IPTp-MQ administration). HIV viral load at delivery was higher in the MQ group compared to the control group (p=0.048) in the ATP analysis. The frequency of perinatal mother to child transmission of HIV was increased in women who received MQ (RR, 1.95 [95% CI 1.14-3.33]; p=0.015). The main limitation of the latter finding relates to the exploratory nature of this part of the analysis. CONCLUSIONS: An effective antimalarial added to CTXp and LLITNs in HIV-infected pregnant women can improve malaria prevention, as well as maternal health through reduction in hospital admissions. However, MQ was not well tolerated, limiting its potential for IPTp and indicating the need to find alternatives with better tolerability to reduce malaria in this particularly vulnerable group. MQ was associated with an increased risk of mother to child transmission of HIV, which warrants a better understanding of the pharmacological interactions between antimalarials and antiretroviral drugs. TRIAL REGISTRATION: ClinicalTrials.gov NCT 00811421; Pan African Clinical Trials Registry PACTR 2010020001813440 Please see later in the article for the Editors' Summary.
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- 2014
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11. Pediatric HIV Care Cascade in Southern Mozambique: Missed Opportunities for Early ART and Re-engagement in Care
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Orvalho Augusto, Clara Menéndez, Elisa López-Varela, Edson Bernardo, Aina Casellas, Sonia Maculuve, Tacilta Nhampossa, Anna Saura-Lázaro, Sheila Fernández-Luis, María Rupérez, Raquel Gonzalez, Denise Naniche, and Laura Fuente-Soro
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Male ,Microbiology (medical) ,Pediatrics ,medicine.medical_specialty ,Pediatric hiv ,Anti-HIV Agents ,Psychological intervention ,HIV Infections ,Lower risk ,03 medical and health sciences ,0302 clinical medicine ,Risk Factors ,Interquartile range ,Surveys and Questionnaires ,030225 pediatrics ,District hospital ,medicine ,Humans ,Community Health Services ,Prospective Studies ,030212 general & internal medicine ,Child ,Prospective cohort study ,Mozambique ,Qualitative Research ,business.industry ,Incidence ,Infant ,Antiretroviral therapy ,Confidence interval ,CD4 Lymphocyte Count ,Infectious Diseases ,Child, Preschool ,Pediatrics, Perinatology and Child Health ,Female ,Lost to Follow-Up ,business - Abstract
BACKGROUND There are 170,000 children living with HIV in 2017 in Mozambique. Scaling-up HIV care requires effective retention along the cascade. We sought to evaluate the pediatric cascade in HIV care at the Manhica District Hospital. METHODS A prospective cohort of children
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- 2020
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12. Assessing usability of QIAreach QuantiFERON-TB platform in a high tuberculosis prevalence, low-resource setting
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Kwame Shanaube, Barry Kosloff, María Rupérez, Helen Ayles, Nduku Ndunda, and Conceptor Kaaba
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Pulmonary and Respiratory Medicine ,medicine.medical_specialty ,Tuberculosis ,business.industry ,Low resource ,Usability ,medicine.disease ,Research Letters ,QuantiFERON ,medicine ,Medicine ,Medical physics ,business - Abstract
The World Health Organization (WHO) estimates that 1.8 billion people, close to a quarter of the world's population are infected with Mycobacterium tuberculosis [1]. Despite substantial declines in tuberculosis (TB) incidence over the past decade, Zambia still has the seventh highest TB incidence in sub-Saharan Africa and remains one of the 30 WHO high TB-burden priority countries [2]. In 2019, there were ∼59 000 new individuals with active TB disease in Zambia (incidence rate of 333 per 100 000 per year), which resulted in 15 400 TB-related deaths, of which 62% were among people living with HIV [2]., QIAreach QuantiFERON-TB is a portable IGRA with the potential to improve accessibility of TB infection diagnosis in low-resource settings https://bit.ly/3nTzolf
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- 2021
13. VAR2CSA Serology to Detect Plasmodium falciparum Transmission Patterns in Pregnancy
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John J. Aponte, Anifa Vala, Charfudin Sacoor, Chenjerai Jairoce, Llorenç Quintó, Raquel González, Michael Ramharter, Jennifer Hegewisch-Taylor, Azucena Bardají, Esperança Sevene, Himanshu Gupta, Peter Ouma, Carlota Dobaño, Simon Kariuki, Chetan E. Chitnis, Pau Cisteró, Ghyslain Mombo-Ngoma, Arsenio Nhacolo, Alfons Jiménez, Meghna Desai, Nicaise Tuikue Ndam, Alfredo Mayor, Michel Cot, Eusebio Macete, Achille Massougbodji, Ana Maria Fonseca, María Rupérez, Clara Menéndez, Valérie Briand, Salim Abdulla, Joe Brew, Marta López, and Athena Institute
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Epidemiology ,Embaràs ,Antibodies, Protozoan ,serology ,lcsh:Medicine ,Tanzania ,VAR2CSA ,Immunoglobulin G ,Serology ,0302 clinical medicine ,Pregnancy ,Benin ,Medicine ,030212 general & internal medicine ,Malaria, Falciparum ,Mozambique ,biology ,transmission ,3. Good health ,Infectious Diseases ,Serologia ,Female ,pregnancy ,Antibody ,Adult ,Microbiology (medical) ,Plasmodium falciparum ,030231 tropical medicine ,Antigens, Protozoan ,parasites ,lcsh:Infectious and parasitic diseases ,Young Adult ,03 medical and health sciences ,SDG 3 - Good Health and Well-being ,Antigen ,parasitic diseases ,Humans ,Seroprevalence ,Serologic Tests ,lcsh:RC109-216 ,Gabon ,business.industry ,Research ,lcsh:R ,biology.organism_classification ,medicine.disease ,Kenya ,immunity ,Malaria ,Spain ,exposure ,Pregnancy Complications, Parasitic ,Immunology ,biology.protein ,business - Abstract
Pregnant women constitute a promising sentinel group for continuous monitoring of malaria transmission. To identify antibody signatures of recent Plasmodium falciparum exposure during pregnancy, we dissected IgG responses against VAR2CSA, the parasite antigen that mediates placental sequestration. We used a multiplex peptide-based suspension array in 2,354 samples from pregnant women from Mozambique, Benin, Kenya, Gabon, Tanzania, and Spain. Two VAR2CSA peptides of limited polymorphism were immunogenic and targeted by IgG responses readily boosted during infection and with estimated half-lives of
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- 2019
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14. Community-based active case-finding interventions for tuberculosis: a systematic review
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Jonathan E. Golub, Rachael M. Burke, Adrienne E Shapiro, Peter MacPherson, Fahd Naufal, María Rupérez, Helen Ayles, Lelia H. Chaisson, Helena R A Feasey, Elizabeth L. Corbett, Marriott Nliwasa, and Lily Telisinghe
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medicine.medical_specialty ,wc_20 ,Tuberculosis ,wa_950 ,Population ,Psychological intervention ,wa_395 ,Population health ,Cochrane Library ,01 natural sciences ,03 medical and health sciences ,0302 clinical medicine ,Environmental health ,Epidemiology ,Medicine ,030212 general & internal medicine ,0101 mathematics ,education ,education.field_of_study ,business.industry ,Incidence (epidemiology) ,010102 general mathematics ,Public Health, Environmental and Occupational Health ,Articles ,medicine.disease ,Sputum ,wf_200 ,Public aspects of medicine ,RA1-1270 ,medicine.symptom ,business - Abstract
Background\ud Community-based active case-finding interventions might identify and treat more people with tuberculosis disease than standard case detection. We aimed to assess whether active case-finding interventions can affect tuberculosis epidemiology in the wider community.\ud Methods\ud We did a systematic review by searching PubMed, Embase, Scopus, and Cochrane Library for studies that compared tuberculosis case notification rates, tuberculosis disease prevalence, or tuberculosis infection prevalence or incidence in children, between populations exposed and unexposed to active case-finding interventions. We included studies published in English between Jan 1, 1980, and April 13, 2020. Studies of active case-finding in the general population, in populations perceived to be at high risk for tuberculosis, and in closed settings were included, whereas studies of tuberculosis screening at health-care facilities, among household contacts, or among children only, and studies that screened fewer than 1000 people were excluded. To estimate effectiveness, we extracted or calculated case notification rates, prevalence of tuberculosis disease, and incidence or prevalence of tuberculosis infection in children, and compared ratios of these outcomes between groups that were exposed or not exposed to active case-finding interventions.\ud Results\ud 27 883 abstracts were screened and 988 articles underwent full text review. 28 studies contributed data for analysis of tuberculosis case notifications, nine for prevalence of tuberculosis disease, and two for incidence or prevalence of tuberculosis infection in children. In one cluster-randomised trial in South Africa and Zambia, an active case-finding intervention based on community mobilisation and sputum drop-off did not affect tuberculosis prevalence, whereas, in a cluster-randomised trial in Vietnam, an active case-finding intervention based on sputum tuberculosis tests for everyone reduced tuberculosis prevalence in the community. We found inconsistent, low-quality evidence that active case-finding might increase the number of cases of tuberculosis notified in populations with structural risk factors for tuberculosis.\ud Interpretation\ud Community-based active case-finding for tuberculosis might be effective in changing tuberculosis epidemiology and thereby improving population health if delivered with high coverage and intensity. If possible, active case-finding projects should incorporate a well designed, robust evaluation to contribute to the evidence base and help elucidate which delivery methods and diagnostic strategies are most effective.\ud Funding\ud WHO Global TB Programme.
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- 2021
15. HIV infection and placental malaria reduce maternal transfer of multiple antimalarial antibodies in Mozambican women
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Marta Vidal, David R. Cavanagh, M. Nelia Manaca, Raquel González, Esperança Sevene, Pau Cisteró, Chenjerai Jairoce, María Rupérez, John J. Aponte, Benoit Gamain, Evelina Angov, Carlota Dobaño, Arsenio Nhacolo, Reyes Balcells, James G. Beeson, Eusebio Macete, Miquel Vázquez-Santiago, Anifa Vala, Selena Alonso, Gemma Moncunill, Alfredo Mayor, Laura Fuente-Soro, Clara Menéndez, Ross L. Coppel, Ruth Aguilar, Gemma Ruiz-Olalla, Instituto de Salud Global - Institute For Global Health [Barcelona] (ISGlobal), Centro de Investigação em Saúde de Manhiça [Maputo, Mozambique] (CISM), Walter Reed Army Institute of Research, Monash University [Melbourne], Biologie Intégrée du Globule Rouge (BIGR (UMR_S_1134 / U1134)), Institut National de la Transfusion Sanguine [Paris] (INTS)-Université de La Réunion (UR)-Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Pointe-à-Pitre/Abymes [Guadeloupe] -Université des Antilles (UA)-Université de Paris (UP), University of Edinburgh, Burnet Institute [Melbourne, Victoria], Eduardo Mondlane University, Gamain, Benoit, and Institut National de la Transfusion Sanguine [Paris] (INTS)-Université de La Réunion (UR)-Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Pointe-à-Pitre/Abymes [Guadeloupe] -Université des Antilles (UA)-Université Paris Cité (UPCité)
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0301 basic medicine ,cord blood antibodies ,[SDV]Life Sciences [q-bio] ,Cord blood antibodies ,Antibodies, Protozoan ,HIV Infections ,placental malaria ,0302 clinical medicine ,Placental malaria ,Pregnancy ,030212 general & internal medicine ,Malaria, Falciparum ,Child ,[SDV.MP.VIR] Life Sciences [q-bio]/Microbiology and Parasitology/Virology ,biology ,3. Good health ,[SDV] Life Sciences [q-bio] ,Infectious Diseases ,[SDV.IMM.IA]Life Sciences [q-bio]/Immunology/Adaptive immunology ,[SDV.IMM.IA] Life Sciences [q-bio]/Immunology/Adaptive immunology ,Cord blood ,[SDV.MP.VIR]Life Sciences [q-bio]/Microbiology and Parasitology/Virology ,[SDV.IMM]Life Sciences [q-bio]/Immunology ,Female ,Antibody ,[SDV.MP.PAR] Life Sciences [q-bio]/Microbiology and Parasitology/Parasitology ,Microbiology (medical) ,Cord ,[SDV.IMM] Life Sciences [q-bio]/Immunology ,IgG ,Plasmodium falciparum ,030106 microbiology ,Antimalarials ,03 medical and health sciences ,Placental transfer ,Antigen ,parasitic diseases ,medicine ,Humans ,[SDV.MP.PAR]Life Sciences [q-bio]/Microbiology and Parasitology/Parasitology ,IgG subclasses ,Maternal antibodies ,business.industry ,Infant ,Transplacental ,HIV ,medicine.disease ,biology.organism_classification ,Malaria ,placental transfer ,maternal antibodies ,Immunology ,biology.protein ,business - Abstract
Objectives: Maternal Plasmodium falciparum-specific antibodies may contribute to protect infants against severe malaria. Our main objective was to evaluate the impact of maternal HIV infection and placental malaria on the cord blood levels and efficiency of placental transfer of IgG and IgG subclasses. Methods: In a cohort of 341 delivering HIV-negative and HIV-positive mothers from southern Mozambique, we measured total IgG and IgG subclasses in maternal and cord blood pairs by quantitative suspension array technology against eight P. falciparum antigens: Duffy-binding like domains 3-4 of VAR2CSA from the erythrocyte membrane protein 1, erythrocyte-binding antigen 140, exported protein 1 (EXP1), merozoite surface proteins 1, 2 and 5, and reticulocyte-binding-homologue-4.2 (Rh4.2). We performed univariable and multivariable regression models to assess the association of maternal HIV infection, placental malaria, maternal variables and pregnancy outcomes on cord antibody levels and antibody transplacental transfer. Results: Maternal antibody levels were the main determinants of cord antibody levels. HIV infection and placental malaria reduced the transfer and cord levels of IgG and IgG1, and this was antigen-dependent. Low birth weight was associated with an increase of IgG2 in cord against EXP1 and Rh4.2. Conclusions: We found lower maternally transferred antibodies in HIV-exposed infants and those born from mothers with placental malaria, which may underlie increased susceptibility to malaria in these children. (C) 2021 The British Infection Association. Published by Elsevier Ltd. All rights reserved.
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- 2021
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16. Reduced Placental Transfer of Antibodies Against a Wide Range of Microbial and Vaccine Antigens in HIV-Infected Women in Mozambique
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Marta Vidal, Evelina Angov, Miquel Vázquez-Santiago, Marta Cova, Reyes Balcells, Ruth Aguilar, María Rupérez, John J. Aponte, Esperança Sevene, Gemma Ruiz-Olalla, Eusebio Macete, Clara Menéndez, Selena Alonso, Raquel González, Chenjerai Jairoce, M. Nelia Manaca, Carlota Dobaño, Arsenio Nhacolo, Pau Cisteró, Anifa Vala, Gemma Moncunill, Laura Fuente-Soro, and Alfredo Mayor
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0301 basic medicine ,Placenta ,HIV Infections ,0302 clinical medicine ,Pregnancy ,Antiretroviral Therapy, Highly Active ,antibody ,Immunology and Allergy ,030212 general & internal medicine ,Maternal-Fetal Exchange ,Mozambique ,Original Research ,Vaccines ,biology ,Fetal Blood ,Protein Transport ,Cord blood ,Female ,Antibody ,Adult ,lcsh:Immunologic diseases. Allergy ,Cord ,IgG ,Immunology ,malaria ,Antibodies ,Young Adult ,03 medical and health sciences ,Sex Factors ,Antigen ,parasitic diseases ,medicine ,Humans ,IgG subclasses ,Antigens ,business.industry ,Transplacental ,HIV ,Plasmodium falciparum ,pathogens ,medicine.disease ,biology.organism_classification ,placental transfer ,030104 developmental biology ,maternal antibodies ,Immunization ,Immunoglobulin G ,biology.protein ,business ,lcsh:RC581-607 ,Immunity, Maternally-Acquired ,Malaria - Abstract
Transplacental transfer of antibodies is essential for conferring protection in newborns against infectious diseases. We assessed the impact of different factors, including gestational age and maternal infections such as HIV and malaria, on the efficiency of cord blood levels and placental transfer of IgG subclasses. We measured total IgG and IgG subclasses by quantitative suspension array technology against 14 pathogens and vaccine antigens, including targets of maternal immunization, in 341 delivering HIV-uninfected and HIV-infected mother-infant pairs from southern Mozambique. We analyzed the association of maternal HIV infection, Plasmodium falciparum exposure, maternal variables and pregnancy outcomes on cord antibody levels and transplacental transfer. Our results show that maternal antibody levels were the main determinant of cord antibody levels. Univariable and multivariable analysis showed that HIV reduced the placental transfer and cord levels of IgG and IgG1 principally, but also IgG2 to half of the antigens tested. P. falciparum exposure and prematurity were negatively associated with cord antibody levels and placental transfer, but this was antigen-subclass dependent. Our findings suggest that lower maternally transferred antibodies may underlie increased susceptibility to infections of HIV-exposed infants. This could affect efficacy of maternal vaccination, especially in sub-Saharan Africa, where there is a high prevalence of HIV, malaria and unfavorable environmental factors.
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- 2021
17. Reduced placental transfer of antibodies against microbial and vaccine antigens in HIV-infected women in Mozambique
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John J. Aponte, Ruth Aguilar, Laura Fuente-Soro, Chenjerai Jairoce, Anifa Vala, Eusebio Macete, Gemma Moncunill, Alfredo Mayor, Miquel Vázquez-Santiago, Marta Vidal, Pau Cisteró, Esperança Sevene, Raquel González, María Rupérez, Arsenio Nhacolo, Clara Menéndez, M. Nelia Manaca, Carlota Dobaño, Gemma Ruiz-Olalla, Marta Cova, Evelina Angov, Reyes Balcells, and Selena Alonso
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Small hairpin RNA ,medicine.anatomical_structure ,biology ,GSK-3 ,Hiv infected ,Cell ,biology.protein ,Wnt signaling pathway ,medicine ,Antibody ,Vaccine antigen ,Induced pluripotent stem cell ,Cell biology - Abstract
Antibody transplacental transfer is essential for conferring protection in newborns against infectious diseases. This transfer may be affected by gestational age and maternal infections, although the effects are not consistent across studies. We measured total IgG and IgG subclasses by quantitative suspension array technology against fourteen pathogens and vaccine antigens, including target of maternal immunization, in 341 delivering HIV− and HIV+ mother-infant pairs from southern Mozambique. Maternal antibody levels were the main determinant of cord antibody levels. HIV broadly reduced the placental transfer and cord levels of IgG and IgG1, but also IgG2 to half of the antigens. Plasmodium falciparum exposure and prematurity were negatively associated with cord antibody levels and placental transfer but this was antigen-subclass dependent. These findings suggest maternal infections may impact the efficacy of maternal immunization and confirm the lower transfer of antibodies as one of the causes underlying increased susceptibility to infections in HIV-exposed infants.
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- 2020
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18. First trimester use of artemisinin-based combination therapy and the risk of low birth weight and small for gestational age
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Esperança Sevene, Eusebio Macete, Peter Ouma, Orvalho Augusto, Stephanie Dellicour, Feiko O. ter Kuile, Seydou Nakanabo-Diallo, Anifa Vala, Halidou Tinto, Andy Stergachis, Umberto D'Alessandro, Adama Kazienga, Meghna Desai, María Rupérez, Innocent Valea, and Gregory S. Calip
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Pharmacovigilance ,ws_410 ,Pregnancy ,Risk Factors ,Prevalence ,qv_256 ,Outpatient clinic ,Prospective cohort study ,Mozambique ,Sub-Saharan Africa ,Quinine ,Obstetrics ,Gestational age ,Small for gestational age ,Artemisinins ,ws_420 ,ws_421 ,Infectious Diseases ,Infant, Small for Gestational Age ,Female ,medicine.symptom ,Record linkage ,Adult ,medicine.medical_specialty ,lcsh:Arctic medicine. Tropical medicine ,lcsh:RC955-962 ,lcsh:Infectious and parasitic diseases ,Antimalarials ,Young Adult ,Burkina Faso ,medicine ,Humans ,lcsh:RC109-216 ,Retrospective Studies ,business.industry ,Research ,Artemether, Lumefantrine Drug Combination ,Prospective cohort ,Infant, Low Birth Weight ,medicine.disease ,Kenya ,Confidence interval ,Malaria ,wc_750 ,Low birth weight ,Pregnancy Trimester, First ,Parasitology ,business - Abstract
Background While there is increasing evidence on the safety of artemisinin-based combination therapy (ACT) for the case management of malaria in early pregnancy, little is known about the association between exposure to ACT during the first trimester and the effect on fetal growth. Methods Data were analysed from prospective studies of pregnant women enrolled in Mozambique, Burkina Faso and Kenya designed to determine the association between anti-malarial drug exposure in the first trimester and pregnancy outcomes, including low birth weight (LBW) and small for gestational age (SGA). Exposure to anti-malarial drugs was ascertained retrospectively by record linkage using a combination of data collected from antenatal and adult outpatient clinic registries, prescription records and self-reported medication usage by the women. Site-level data synthesis (fixed effects and random effects) was conducted as well as individual-level analysis (fixed effects by site). Results Overall, 1915 newborns were included with 92 and 26 exposed to ACT (artemether–lumefantrine) and quinine, respectively. In Burkina Faso, Mozambique and Kenya at recruitment, the mean age (standard deviation) was 27.1 (6.6), 24.2 (6.2) and 25.7 (6.5) years, and the mean gestational age was 24.0 (6.2), 21.2 (5.7) and 17.9 (10.2) weeks, respectively. The LBW prevalence among newborns born to women exposed to ACT and quinine (QNN) during the first trimester was 10/92 (10.9%) and 7/26 (26.9%), respectively, compared to 9.5% (171/1797) among women unexposed to any anti-malarials during pregnancy. Compared to those unexposed to anti-malarials, ACT and QNN exposed women had the pooled LBW prevalence ratio (PR) of 1.13 (95% confidence interval (CI) 0.62–2.05, p-value 0.700) and 2.03 (95% CI 1.09–3.78, p-value 0.027), respectively. Compared to those unexposed to anti-malarials ACT and QNN-exposed women had the pooled SGA PR of 0.85 (95% CI 0.50–1.44, p-value 0.543) and 1.41 (95% CI 0.71–2.77, p-value 0.322), respectively. Whereas compared to ACT-exposed, the QNN-exposed had a PR of 2.14 (95% CI 0.78–5.89, p-value 0.142) for LBW and 8.60 (95% CI 1.29–57.6, p-value 0.027) for SGA. The level of between sites heterogeneity was moderate to high. Conclusion ACT exposure during the first trimester was not associated with an increased occurrence of LBW or SGA. However, the data suggest a higher prevalence of LBW and SGA for children born to QNN-exposed pregnancies. The findings support the use of ACT (artemether–lumefantrine) for the treatment of uncomplicated malaria during the first trimester of pregnancy.
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- 2020
19. Discordant retention of HIV-infected mothers and children: Evidence for a family-based approach from Southern Mozambique
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Raquel Gonzalez, Orvalho Augusto, Edson Bernardo, Tacilta Nhampossa, Denise Naniche, Aina Casellas, Sheila Fernandez, Elisa López-Varela, Anna Saura, S Ó Nia Maculuve, María Rupérez, Laura Fuente-Soro, Paula Vaz, W Chris Buck, Esmeralda Karajeans, and Clara Menéndez
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Male ,Pediatrics ,Pediatric AIDS ,family ,Cohort Studies ,0302 clinical medicine ,Mother and child ,Medicine ,030212 general & internal medicine ,Child ,Mozambique ,Multinomial logistic regression ,Pediatric ,General Medicine ,Infectious Diseases ,030220 oncology & carcinogenesis ,Cohort ,HIV/AIDS ,Female ,Family Practice ,Infection ,ART ,Cohort study ,HIV infections ,Adult ,medicine.medical_specialty ,retention ,Anti-HIV Agents ,Concordance ,MEDLINE ,Mothers ,03 medical and health sciences ,children ,Clinical Research ,Humans ,Lost to follow-up ,Preschool ,lost to follow up ,business.industry ,Infant ,HIV ,Newborn ,Good Health and Well Being ,Patient Compliance ,Observational study ,Lost to Follow-Up ,Infeccions per VIH ,business ,Family based ,Mares i fills - Abstract
It is often assumed that children and their caregivers either stay in care together or discontinue together, but data is lacking on caregiver-child retention concordance. We sought to describe the pattern of care among a cohort of human immunodeficiency virus (HIV) infected children and mothers enrolled in care at the Manhi\xC3\xA7a District Hospital (MDH).This was a retrospective review of routine HIV clinical data collected under a larger prospective HIV cohort study at MDH. Children enrolling HIV care from January 2013 to November 2016 were identified and matched to their mother's HIV clinical data. Retention in care for mothers and children was assessed at 24 months after the child's enrolment. Multinomial logistic regression was performed to evaluate variables associated with retention discordance.For the 351 mother-child pairs included in the study, only 39% of mothers had concordant care status at baseline (23% already active in care, 16% initiated care concurrently with their children). At 24-months follow up, a total of 108 (31%) mother-child pairs were concordantly retained in care, 88 (26%) pairs were concordantly lost to follow up (LTFU), and 149 (43%) had discordant retention. Pairs with concurrent registration had a higher probability of being concordantly retained in care. Children who presented with advanced clinical or immunological stage had increased probability of being concordantly LTFU.High rates of LTFU as well as high proportions of discordant retention among mother-child pairs were found. Prioritization of a family-based care model that has the potential to improve retention for children and caregivers is recommended."
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- 2020
20. Does tuberculosis screening improve individual outcomes? A systematic review
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M Hassan, C. R. Miller, Peter MacPherson, C Daneshvar, Lelia H. Chaisson, Jonathan E. Golub, Lawrence Mwenge, Tila Mainga, Virginia Bond, Rachael M. Burke, Fahd Naufal, R Kumar, Adrienne E Shapiro, Richard J. Hayes, Helen Ayles, María Rupérez, M Amofa-Sekyi, L Telisinghe, E Klinkenberg, and Elizabeth L. Corbett
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Medicine (General) ,medicine.medical_specialty ,wa_950 ,Research paper ,Tuberculosis ,Treatment outcome ,Tuberculosis screening ,Cochrane Library ,Active case-finding ,R5-920 ,Individual effects ,Internal medicine ,Catastrophic costs ,Case fatality rate ,medicine ,Mortality ,Disease severity ,Case fatality ,Economic consequences ,business.industry ,wa_900 ,Treatment outcomes ,General Medicine ,medicine.disease ,Systematic review ,Patient costs ,Screening ,wf_220 ,Observational study ,wf_200 ,Enhanced case-finding ,Outcome data ,business - Abstract
Background To determine if tuberculosis (TB) screening improves patient outcomes, we conducted two systematic reviews to investigate the effect of TB screening on diagnosis, treatment outcomes, deaths (clinical review assessing 23 outcome indicators); and patient costs (economic review). Methods Pubmed, EMBASE, Scopus and the Cochrane Library were searched between 1/1/1980-13/4/2020 (clinical review) and 1/1/2010-14/8/2020 (economic review). As studies were heterogeneous, data synthesis was narrative. Findings Clinical review: of 27,270 articles, 18 (n=3 trials) were eligible. Nine involved general populations. Compared to passive case finding (PCF), studies showed lower smear grade (n=2/3) and time to diagnosis (n=2/3); higher pre-treatment losses to follow-up (screened 23% and 29% vs PCF 15% and 14%; n=2/2); and similar treatment success (range 68-81%; n=4) and case fatality (range 3-11%; n=5) in the screened group. Nine reported on risk groups. Compared to PCF, studies showed lower smear positivity among those culture-confirmed (n=3/4) and time to diagnosis (n=2/2); and similar (range 80-90%; n=2/2) treatment success in the screened group. Case fatality was lower in n=2/3 observational studies; both reported on established screening programmes. A neonatal trial and post-hoc analysis of a household contacts trial found screening was associated with lower all-cause mortality. Economic review: From 2841 articles, six observational studies were eligible. Total costs (n=6) and catastrophic cost prevalence (n=4; range screened 9-45% vs PCF 12-61%) was lower among those screened. Interpretation We found very limited patient outcome data. Collecting and reporting this data must be prioritised to inform policy and practice. Funding WHO and EDCTP.
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- 2021
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21. Resisting and tolerating P. falciparum in pregnancy under different malaria transmission intensities
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Pau Cisteró, Llorenç Quintó, Anifa Vala, Peter G. Kremsner, Raquel González, Nicaise Tuikue Ndam, Arsenio Nhacolo, Emmanuel Mbuba, Ghyslain Mombo-Ngoma, Sonia Maculuve, Achille Massougbodji, Peter Ouma, Valérie Briand, Clara Menéndez, Michel Cot, Ana Maria Fonseca, John J. Aponte, Alfons Jiménez, Meghna Desai, María Rupérez, Eusebio Macete, Esperança Sevene, Simon Kariuki, Alfredo Mayor, and Michael Ramharter
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0301 basic medicine ,Placenta ,Resistance ,lcsh:Medicine ,HIV Infections ,Disease ,0302 clinical medicine ,Pregnancy ,Prevalence ,Malaria, Falciparum ,Pregnancy Complications, Infectious ,Young adult ,Mozambique ,Microscopy ,biology ,Obstetrics ,Pregnancy Outcome ,General Medicine ,Female ,Antibody ,Research Article ,Adult ,medicine.medical_specialty ,Qualitative evidence ,Plasmodium falciparum ,030231 tropical medicine ,Malària ,Real-Time Polymerase Chain Reaction ,Young Adult ,03 medical and health sciences ,Embarassades ,Malaria transmission ,parasitic diseases ,medicine ,Humans ,Gabon ,business.industry ,Pregnant women ,lcsh:R ,Infant, Newborn ,Parturition ,Immunity ,Delivery, Obstetric ,medicine.disease ,biology.organism_classification ,Kenya ,Vector control ,Malaria ,030104 developmental biology ,Immunology ,biology.protein ,business ,Tolerance - Abstract
Background Resistance and tolerance to Plasmodium falciparum can determine the progression of malaria disease. However, quantitative evidence of tolerance is still limited. We investigated variations in the adverse impact of P. falciparum infections among African pregnant women under different intensities of malaria transmission. Methods P. falciparum at delivery was assessed by microscopy, quantitative PCR (qPCR) and placental histology in 946 HIV-uninfected and 768 HIV-infected pregnant women from Benin, Gabon, Kenya and Mozambique. Resistance was defined by the proportion of submicroscopic infections and the levels of anti-parasite antibodies quantified by Luminex, and tolerance by the relationship of pregnancy outcomes with parasite densities at delivery. Results P. falciparum prevalence by qPCR in peripheral and/or placental blood of HIV-uninfected Mozambican, Gabonese and Beninese women at delivery was 6% (21/340), 11% (28/257) and 41% (143/349), respectively. The proportion of peripheral submicroscopic infections was higher in Benin (83%) than in Mozambique (60%) and Gabon (55%; P = 0.033). Past or chronic placental P. falciparum infection was associated with an increased risk of preterm birth in Mozambican newborns (OR = 7.05, 95% CI 1.79 to 27.82). Microscopic infections were associated with reductions in haemoglobin levels at delivery among Mozambican women (–1.17 g/dL, 95% CI –2.09 to –0.24) as well as with larger drops in haemoglobin levels from recruitment to delivery in Mozambican (–1.66 g/dL, 95% CI –2.68 to –0.64) and Gabonese (–0.91 g/dL, 95% CI –1.79 to –0.02) women. Doubling qPCR-peripheral parasite densities in Mozambican women were associated with decreases in haemoglobin levels at delivery (–0.16 g/dL, 95% CI –0.29 to –0.02) and increases in the drop of haemoglobin levels (–0.29 g/dL, 95% CI –0.44 to –0.14). Beninese women had higher anti-parasite IgGs than Mozambican women (P
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- 2017
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22. Pathophysiology of Anemia in HIV-Infected Children Exposed to Malaria
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John J. Aponte, Llorenç Quintó, Tacilta Nhampossa, Montserrat Renom, María Rupérez, Pedro L. Alonso, Eusebio Macete, Ariel H. Achtman, Louis Schofield, Ruth Aguilar, Cinta Moraleda, María Del Mar Mañú Pereira, Clara Menéndez, and Augusto Nhabomba
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Male ,medicine.medical_specialty ,Anemia ,HIV Infections ,Parasitemia ,Comorbidity ,Risk Assessment ,Risk Factors ,Virology ,Internal medicine ,medicine ,Prevalence ,Humans ,Mozambique ,biology ,business.industry ,Infant, Newborn ,Infant ,Plasmodium falciparum ,Iron deficiency ,Iron Deficiencies ,Articles ,medicine.disease ,biology.organism_classification ,Malaria ,Malnutrition ,Infectious Diseases ,Case-Control Studies ,Child, Preschool ,Etiology ,Parasitology ,Female ,Hemoglobin ,business - Abstract
Anemia is a common condition in HIV-infected children; however, its pathophysiology and the contribution of frequent causes of anemia such as iron deficiency (ID) and malaria are poorly understood. We carried out an ancillary study on the effect of HIV on anemia as part of a case–control study on risk factors of anemia among Mozambican children aged 1–59 months with documented HIV status. Of them, 390 children were admitted to the hospital with anemia (hemoglobin [Hb] < 11 g/dL), whereas 272 children without anemia (Hb ≥ 11 g/dL) were recruited in the community. We assessed differences by HIV status in the presentation of anemia etiological factors and the effect of HIV infection on the association of each factor with anemia. Among the 99 HIV-infected and 563 uninfected children included, HIV-infected anemic children had an increased risk of undernutrition (P < 0.0001), Epstein–Barr virus infection (P < 0.0001), bacteremia (P = 0.0060), a decreased risk of malaria (P < 0.0001), and a similar risk of ID (P = 0.7371) compared with anemic-uninfected children. HIV-infected children were significantly less likely to have anemia associated with Plasmodium falciparum hyperparasitemia (P = 0.0444) and had a lower prevalence of parasitemia in the bone marrow (BM) (P < 0.0001) than anemic-uninfected children. Levels of BM erythropoiesis and dyserythropoiesis were comparable between groups. These findings suggest that the pathophysiology of anemia among HIV-infected malaria-exposed children is not related to HIV-specific effects. For unclear reasons, HIV-infected children had reduced risk of malaria infection, whereas ID prevalence was comparable in HIV-infected and uninfected children, suggesting that iron supplementation recommendations should not be different in HIV-infected children.
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- 2019
23. Association of Maternal Factors and HIV Infection With Innate Cytokine Responses of Delivering Mothers and Newborns in Mozambique
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Gemma Moncunill, Carlota Dobaño, Raquel González, Kinga K. Smolen, Maria N. Manaca, Reyes Balcells, Chenjerai Jairoce, Pau Cisteró, Anifa Vala, Esperança Sevene, María Rupérez, John J. Aponte, Eusébio Macete, Clara Menéndez, Tobias R. Kollmann, and Alfredo Mayor
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Microbiology (medical) ,Newborn infants ,Anemia ,lcsh:QR1-502 ,Microbiology ,lcsh:Microbiology ,03 medical and health sciences ,Embarassades ,medicine ,Infants nadons ,HIV exposed uninfected ,innate immunity ,030304 developmental biology ,Original Research ,0303 health sciences ,Pregnancy ,Fetus ,Innate immune system ,030306 microbiology ,business.industry ,Pregnant women ,Pattern recognition receptor ,pattern recognition receptors ,cord ,HIV ,medicine.disease ,Acquired immune system ,anemia ,cytokines ,Cord blood ,Citocines ,Cohort ,Immunology ,Cytokines ,Infeccions per VIH ,business ,pregnant women ,HIV infections - Abstract
Maternal factors and exposure to pathogens have an impact on infant health. For instance, HIV exposed but uninfected infants have higher morbidity and mortality than HIV unexposed infants. Innate responses are the first line of defense and orchestrate the subsequent adaptive immune response and are especially relevant in newborns. To determine the association of maternal HIV infection with maternal and newborn innate immunity we analyzed the cytokine responses upon pattern recognition receptor (PRR) stimulations in the triad of maternal peripheral and placental blood as well as in cord blood in a cohort of mother-infant pairs from southern Mozambique. A total of 48 women (35 HIV-uninfected and 13 HIV-infected) were included. Women and infant innate responses positively correlated with each other. Age, gravidity and sex of the fetus had some associations with spontaneous production of cytokines in the maternal peripheral blood. HIV-infected women not receiving antiretroviral therapy (ART) before pregnancy showed decreased IL-8 and IL-6 PRR responses in peripheral blood compared to those HIV-uninfected, and PRR hyporesponsiveness for IL-8 was also found in the corresponding infant's cord blood. HIV infection had a greater impact on placental blood responses, with significantly increased pro-inflammatory, T H 1 and T H 17 PRR responses in HIV-infected women not receiving ART before pregnancy compared to HIV-uninfected women. In conclusion, innate response of the mother and her newborn was altered by HIV infection in the women who did not receive ART before pregnancy. As these responses could be related to birth outcomes, targeted innate immune modulation could improve maternal and newborn health.
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- 2019
24. Assessment of non-tuberculosis abnormalities on digital chest x-rays with high CAD4TB scores from a tuberculosis prevalence survey in Zambia and South Africa
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Dennis Ngosa, Given Moonga, Kwame Shanaube, Choolwe Jacobs, Maria Ruperez, Nkatya Kasese, Eveline Klinkenberg, Ab Schaap, Linda Mureithi, Sian Floyd, Sarah Fidler, Veronica Sichizya, Adrian Maleya, and Helen Ayles
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Prevalence ,Computer-aided detection ,Non-TB abnormalities ,Digital chest X-rays ,Infectious and parasitic diseases ,RC109-216 - Abstract
Abstract Background Chest X-rays (CXRs) have traditionally been used to aid the diagnosis of TB-suggestive abnormalities. Using Computer-Aided Detection (CAD) algorithms, TB risk is quantified to assist with diagnostics. However, CXRs capture all other structural abnormalities. Identification of non-TB abnormalities in individuals with CXRs that have high CAD scores but don’t have bacteriologically confirmed TB is unknown. This presents a missed opportunity of extending novel CAD systems’ potential to simultaneously provide information on other non-TB abnormalities alongside TB. This study aimed to characterize and estimate the prevalence of non-TB abnormalities on digital CXRs with high CAD4TB scores from a TB prevalence survey in Zambia and South Africa. Methodology This was a cross-sectional analysis of clinical data of participants from the TREATS TB prevalence survey conducted in 21 communities in Zambia and South Africa. The study included individuals aged ≥ 15 years who had high CAD4TB scores (score ≥ 70), but had no bacteriologically confirmed TB in any of the samples submitted, were not on TB treatment, and had no history of TB. Two consultant radiologists reviewed the images for non-TB abnormalities. Results Of the 525 CXRs reviewed, 46.7% (245/525) images were reported to have non-TB abnormalities. About 11.43% (28/245) images had multiple non-TB abnormalities, while 88.67% (217/245) had a single non-TB abnormality. The readers had a fair inter-rater agreement (r = 0.40). Based on anatomical location, non-TB abnormalities in the lung parenchyma (19%) were the most prevalent, followed by Pleura (15.4%), then heart & great vessels (6.1%) abnormalities. Pleural effusion/thickening/calcification (8.8%) and cardiomegaly (5%) were the most prevalent non-TB abnormalities. Prevalence of (2.7%) for pneumonia not typical of pulmonary TB and (2.1%) mass/nodules (benign/ malignant) were also reported. Conclusion A wide range of non-TB abnormalities can be identified on digital CXRs among individuals with high CAD4TB scores but don’t have bacteriologically confirmed TB. Adaptation of AI systems like CAD4TB as a tool to simultaneously identify other causes of abnormal CXRs alongside TB can be interesting and useful in non-faculty-based screening programs to better link cases to appropriate care.
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- 2023
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25. Creating access to SARS-CoV-2 screening and testing through community-based COVID-19 case-finding, observations from cross-sectional studies in Lesotho and Zambia
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Eveline Klinkenberg, Bulemba Katende, Maria Ruperez, Moniek Bresser, Bxyn Kangololo, Justin Bwalya, Rahel M. Erhardt, Ab Schaap, Nkatya Kasese, Thomas Gatchie, Sian Floyd, ‘Mota J. ‘Mota, Helen Ayles, Kwame Shanaube, and Klaus Reither
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COVID-19 ,Community testing ,Lesotho ,Zambia ,SARS-CoV-2 ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background The health impact of the COVID-19 pandemic largely depends on the ability of the healthcare systems to develop effective and adaptable preparedness and mitigation strategies. A collaborative initiative (BRCCH-EDCTP COVID-19 Initiative) was set up between Lesotho and Zambia early on in the pandemic, to jointly conduct a project to investigate creating access to SARS-CoV-2 screening and testing through community-based COVID-19 case-finding. Methods Two different community case-finding strategies were deployed. In Lesotho, an approach was implemented whereby a community (village) health worker screened community members at their home or during community gatherings for COVID-19 signs and symptoms. All community members who screened positive were then offered SARS-CoV-2 testing. In Zambia, so-called community hubs, staffed by community health care workers, were set up at different locations in the community for people to walk in and get tested for SARS-CoV-2. Hubs changed location from week-to-week and targeted transmission hotspots. All persons visiting the hubs were offered testing for SARS-CoV-2 irrespective of self-reported signs and symptoms of COVID-19 though information was collected on occurrence of these. Testing in both approaches was done using SARS-CoV-2 rapid antigen tests. Results Setting up testing in the community setting was feasible in both countries. In Lesotho in the village health worker approach, over a period of 46 weeks, 7221 persons were screened, and 49 (11.4%) SARS-COV-2 cases identified among 428 COVID-19 screen positive participants. In the community hubs among 3150 people tested, 166 (5.3%) SARS-CoV-2 cases were identified in a period of 26 weeks. From the community hubs approach, where all seen were offered COVID-19 testing it was learned that people screening positive for COVID-19 signs and symptoms were more likely to test SARS-COV-2 positive, especially those reporting classic COVID-19 symptoms like loss of sense/smell for a short period of time (1–3 days). Conclusions In conclusion, in this project we learned that implementing COVID-19 screening and testing by lay health workers in the community is possible. Characteristics of the population screened, tested, and identified to have SARS-CoV-2 are described to help guide development of future testing strategies.
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- 2023
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26. Comparing patterns of recent and remote Mycobacterium tuberculosis infection determined using the QuantiFERON-TB Gold Plus assay in a high TB burden setting.
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Modupe Amofa-Sekyi, Ab Schaap, Linda Mureithi, Barry Kosloff, Maina Cheeba, Bxyn Kangololo, Redwaan Vermaak, Robynn Paulsen, Maria Ruperez, Sian Floyd, Petra de Haas, Sarah Fidler, Richard Hayes, Helen Ayles, Kwame Shanaube, and TREATS study team
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Public aspects of medicine ,RA1-1270 - Abstract
One quarter of the world's population is estimated to be infected with Mycobacterium tuberculosis. Identifying recent TB infection (TBI) offers an avenue to targeted TB preventative therapy provision, and prevention to disease progression. However, detecting recent TBI remains challenging. The QuantiFERON-TB Gold Plus assay (QFT-Plus) claims to have improved sensitivity in detecting recent TBI, by the addition of the TB2 antigen tube to the TB1 tube used in previous tests. TB2 detects CD8-mediated interferon gamma response, a potential marker of recent infection. We compared QFT-Plus TB1 and TB2 responses in individuals with recent and remote infection in high-burden settings. The Tuberculosis Reduction through Expanded Antiretroviral Treatment and TB Screening (TREATS) Project followed a cohort of adolescents and young people (AYP) aged 15-24 years in Zambia and South Africa to determine TBI incidence measured by QFT-Plus over 24 months. We categorised individuals with QTF-Plus positive result into recent and remote infection. We compared their TB1 and TB2 responses and the antigen tube differential [TB2-TB1], an indicator of CD8-activity, using logistic regression. At baseline, 3876 AYP, 1852/3876 (47.8%) were QFT-Plus positive whilst 2024/3876 (52.2%) QFT-Plus negative. Of the QFT-Plus baseline positives, 1069/1852 (57.7%) tested positive at both 12 and 24 months-remote infection. Of the QFT-Plus baseline negatives, 274/2024(13.3%) converted within a 12-month period- recent infection. TB1 and TB2 responses were higher in remote than recent infection. In recent infection, TB2 responses were greater than TB1 responses. The mean differential was 0.01 IU/ml in recent and -0.22 IU/ml in remote infection, (p = 0.145). The quantitative QFT-Plus results did not appear to reflect a marked distinction between recent and remote infection. Further analysis of the responses of infected individuals who developed disease is required to determine whether any signal in QFT-Plus results may predict progression to disease.
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- 2024
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27. Evaluation of COVID-19 antigen rapid diagnostic tests for self-testing in Lesotho and Zambia.
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Moniek Bresser, Rahel Milena Erhardt, Kwame Shanaube, Musonda Simwinga, Palesa Agnes Mahlatsi, Jennifer Belus, Albertus Schaap, Alain Amstutz, Thomas Gachie, Tracy Renée Glass, Bxyn Kangololo, John 'Mota, Sian Floyd, Bulemba Katende, Eveline Klinkenberg, Helen Ayles, Klaus Reither, and Maria Ruperez
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Medicine ,Science - Abstract
IntroductionThe use of antigen rapid tests (Ag-RDTs) for self-testing is an important element of the COVID-19 control strategy and has been widely supported. However, scale-up of self-testing for COVID-19 in sub-Saharan Africa is still insufficient and there is limited evidence on the acceptability of self-testing and agreement between Ag-RDT self-testing and Ag-RDT testing by professional users. A joint collaboration (Botnar Research Centre for Child Health-European & Developing countries Clinical Trials Partnership)was established between Lesotho and Zambia to address these gaps in relation to Ag-RDT self-testing and contribute to increasing its use in the region.MethodsA cross-sectional study was conducted with qualitative and quantitative data analysis. Firstly, 14 in-depth cognitive interviews (5 in Zambia and 9 in Lesotho) were performed to assess the participants' understanding of the instructions for use (IFU) for self-testing. In a second step, evaluation of test agreement between Ag-RDT self-testing and Ag-RDT testing by professional user using SD Biosensor STANDARD Q COVID-19 Ag-RDT was performed. In Zambia, usability and acceptability of self-testing were also assessed.ResultsCognitive interviews in Lesotho and Zambia showed overall good understanding of IFU. In Zambia, acceptability of self-testing was high, though some participants had difficulties in conducting certain steps in the IFU correctly. Agreement between Ag-RDT self-test and Ag-RDT by professional users in Lesotho (428 participants) and Zambia (1136 participants) was high, 97.3% (403/414, 95% CI: 95.3-98.7) and 99.8% (1116/1118, 95% CI: 99.4-100) respectively.ConclusionFindings from this study support the use of Ag-RDT self-testing within COVID-19 control strategies in sub-Saharan Africa, contributing to increase the testing capacity and access in hard-to reach settings.
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- 2024
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28. HIV drug resistance patterns in pregnant women using next generation sequence in Mozambique
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Raquel González, Marc Noguera-Julian, María Rupérez, Anifa Vala, Sonia Maculuve, Clara Menéndez, Cristina Rodríguez, Rocío Bellido, Esperança Sevene, and Roger Paredes
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RNA viruses ,0301 basic medicine ,Maternal Health ,lcsh:Medicine ,HIV Infections ,Pathology and Laboratory Medicine ,0302 clinical medicine ,Immunodeficiency Viruses ,Pregnancy ,Medicine and Health Sciences ,Medicine ,Public and Occupational Health ,030212 general & internal medicine ,Pregnancy Complications, Infectious ,Young adult ,lcsh:Science ,Mozambique ,Multidisciplinary ,Pharmaceutics ,Obstetrics ,Obstetrics and Gynecology ,virus diseases ,Prenatal Care ,Viral Load ,Vaccination and Immunization ,Medical Microbiology ,Viral Pathogens ,Viruses ,Female ,Pathogens ,Viral load ,HIV drug resistance ,Research Article ,Adult ,medicine.medical_specialty ,Anti-HIV Agents ,Immunology ,030106 microbiology ,Antiretroviral Therapy ,Viremia ,Prenatal care ,Microbiology ,Young Adult ,03 medical and health sciences ,Embarassades ,Antiviral Therapy ,Antenatal Care ,Microbial Control ,Virology ,Retroviruses ,Drug Resistance, Viral ,VIH (Virus) ,Humans ,Microbial Pathogens ,Pharmacology ,business.industry ,HIV (Viruses) ,Pregnant women ,Lentivirus ,lcsh:R ,Organisms ,Biology and Life Sciences ,HIV ,medicine.disease ,Moçambic ,Antiretroviral therapy ,Infectious Disease Transmission, Vertical ,CD4 Lymphocyte Count ,HIV-1 ,Women's Health ,lcsh:Q ,Antimicrobial Resistance ,Preventive Medicine ,Rural area ,Drug Delivery ,business ,Viral Transmission and Infection - Abstract
BACKGROUND: Few data on HIV resistance in pregnancy are available from Mozambique, one of the countries with the highest HIV toll worldwide. Understanding the patterns of HIV drug resistance in pregnant women might help in tailoring optimal regimens for prevention of mother to child transmission of HIV (pMTCT) and antenatal care. OBJECTIVES: To describe the frequency and characteristics of HIV drug resistance mutations (HIVDRM) in pregnant women with virological failure at delivery, despite pMTCT or antiretroviral therapy (ART). METHODS: Samples from HIV-infected pregnant women from a rural area in southern Mozambique were analysed. Only women with HIV-1 RNA >400c/mL at delivery were included in the analysis. HIVDRM were determined using MiSeq(R) (detection threshold 1%) at the first antenatal care (ANC) visit and at the time of delivery. RESULTS: Ninety and 60 samples were available at the first ANC visit and delivery, respectively. At first ANC, 97% of the women had HIV-1 RNA>400c/mL, 39% had CD4+ counts
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- 2018
29. Determinants of virological failure and antiretroviral drug resistance in Mozambique
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Christian Pou, María Rupérez, Eusebio Macete, Roger Paredes, Judith Rodríguez, Bonaventura Clotet, Denise Naniche, Sonia Maculuve, José Moltó, Emilio Letang, Clara Menéndez, Samandhy Cedeño, Leopoldina Luis, Pedro L. Alonso, and Universitat de Vic - Universitat Central de Catalunya. Càtedra de la Sida i Malalties Relacionades
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Adult ,Male ,Microbiology (medical) ,medicine.medical_specialty ,Genotype ,Genotyping Techniques ,Art initiation ,HIV Infections ,Antiretroviral drug ,Viremia ,Drug resistance ,Logistic regression ,Internal medicine ,Drug Resistance, Viral ,VIH (Virus) ,medicine ,Humans ,Pharmacology (medical) ,Treatment Failure ,Mozambique ,Pharmacology ,business.industry ,Public health ,Middle Aged ,Sida -- Tractament ,medicine.disease ,Virology ,Virological failure ,Suburban Population ,Cross-Sectional Studies ,Infectious Diseases ,Anti-Retroviral Agents ,HIV-1 ,Female ,Drug Monitoring ,business ,HIV drug resistance - Abstract
Objectives: The objective of this study was to inform public health actions to limit first-line ART failure and HIV drug resistance in Mozambique. Methods: This was a cross-sectional study. HIV-1-infected adults on first-line ART for at least 1 year attending routine visits in the Manhic¸a District Hospital, in a semi-rural area in southern Mozambique with no HIV-1 RNA monitoring available, were evaluated for clinical, socio-demographic, therapeutic, immunological and virological characteristics. Factors associated with HIV-1 RNA ≥1000 copies/mL and HIV drug resistance were determined using multivariate logistic regression. Results: The study included 334 adults on first-line ART for a median of 3 years, of which 65% (214/332) had suppressed viraemia, 11% (37/332) had low-level viraemia (HIV-1 RNA 150–999 copies/mL) and 24% (81/332) had overt virological failure (HIV-1 RNA ≥1000 copies/mL). HIV drug resistance was detected in 89% of subjects with virological failure, but in none with low-level viraemia. Younger age [OR¼0.97 per additional year (95% CI¼0.94–1.00), P¼0.039], ART initiation at WHO stage III/IV [OR¼2.10 (95% CI¼1.23–3.57), P¼0.003] and low ART adherence [OR¼2.69 (95% CI¼1.39–5.19), P¼0.003] were associated with virological failure. Longer time on ART [OR¼1.55 per additional year (95% CI¼1.00–2.43), P¼0.052] and illiteracy [OR¼0.24 (95% CI¼0.07–0.89), P¼0.033] were associated with HIV drug resistance. Compared with HIV-1 RNA, clinician’s judgement of ART failure, based on clinical and immunological outcomes, only achieved 29% sensitivity and misdiagnosed 1 out of every 4.5 subjects. Conclusions: Public health programmes in Mozambique should focus on early HIV diagnosis, early ART initiation and adherence support. Virological monitoring drastically improves the diagnosis of ART failure, enabling a better use of resources.
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- 2015
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30. Multiplexing detection of IgG against Plasmodium falciparum pregnancy-specific antigens
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John J. Aponte, Raquel González, Alfredo Mayor, Esperanza Sevene, Alfons Jiménez, Llorenç Quintó, Ana Maria Fonseca, Anifa Vala, María Rupérez, Clara Menéndez, Carlota Dobaño, Azucena Bardají, Eusebio Macete, and Sonia Maculuve
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0301 basic medicine ,Bacterial Diseases ,Erythrocytes ,Physiology ,Maternal Health ,Antibodies, Protozoan ,lcsh:Medicine ,Toxicology ,Pathology and Laboratory Medicine ,Biochemistry ,Serology ,Pregnancy ,Immune Physiology ,Medicine and Health Sciences ,Toxins ,Multiplex ,Malaria, Falciparum ,lcsh:Science ,Mozambique ,Immunoassay ,Multidisciplinary ,Immune System Proteins ,biology ,medicine.diagnostic_test ,Obstetrics and Gynecology ,Recombinant Proteins ,3. Good health ,Body Fluids ,medicine.anatomical_structure ,Blood ,Infectious Diseases ,Female ,Antibody ,Anatomy ,Research Article ,Adult ,Immunology ,Toxic Agents ,Plasmodium falciparum ,Protein Array Analysis ,Immunoglobulins ,Antigens, Protozoan ,Blood Plasma ,Antibodies ,03 medical and health sciences ,Young Adult ,Embarassades ,Antigen ,Placenta ,parasitic diseases ,medicine ,Parasitic Diseases ,Humans ,Tetanus ,business.industry ,Pregnant women ,lcsh:R ,Biology and Life Sciences ,Proteins ,biology.organism_classification ,medicine.disease ,Tropical Diseases ,Malaria ,030104 developmental biology ,Immunoglobulin G ,biology.protein ,Women's Health ,lcsh:Q ,Dried Blood Spot Testing ,business ,Peptides ,Immunoglobulines - Abstract
Background Pregnant women exposed to Plasmodium falciparum generate antibodies against VAR2CSA, the parasite protein that mediates adhesion of infected erythrocytes to the placenta. There is a need of high-throughput tools to determine the fine specificity of these antibodies that can be used to identify immune correlates of protection and exposure. Here we aimed at developing a multiplex-immunoassay to detect antibodies against VAR2CSA antigens. Methods and findings We constructed two multiplex-bead arrays, one composed of 3 VAR2CSA recombinant-domains (DBL3X, DBL5Ɛ and DBL6Ɛ) and another composed of 46 new peptides covering VAR2CSA conserved and semi-conserved regions. IgG reactivity was similar in multiplexed and singleplexed determinations (Pearson correlation, protein array: R2 = 0.99 and peptide array: R2 = 0.87). IgG recognition of 25 out of 46 peptides and all recombinant-domains was higher in pregnant Mozambican women (n = 106) than in Mozambican men (n = 102) and Spanish individuals (n = 101; p
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- 2017
31. Effects of HIV infection on maternal and neonatal health in southern Mozambique: A prospective cohort study after a decade of antiretroviral drugs roll out
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Sonia Maculuve, Anifa Vala, Raquel González, Clara Menéndez, Helder Bulo, María Rupérez, John J. Aponte, Alfredo Mayor, Arsenio Nhacolo, Eusebio Macete, and Esperança Sevene
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RNA viruses ,Pediatrics ,Maternal Health ,Human immunodeficiency virus (HIV) ,lcsh:Medicine ,HIV Infections ,Pathology and Laboratory Medicine ,medicine.disease_cause ,Families ,0302 clinical medicine ,Immunodeficiency Viruses ,Pregnancy ,Medicine and Health Sciences ,Prospective Studies ,030212 general & internal medicine ,Pregnancy Complications, Infectious ,Young adult ,lcsh:Science ,Prospective cohort study ,Children ,Mozambique ,Protozoans ,Multidisciplinary ,Incidence (epidemiology) ,Pregnancy Outcome ,Malarial Parasites ,Obstetrics and Gynecology ,Anemia ,Hematology ,Maternal Mortality ,Medical Microbiology ,Viral Pathogens ,Viruses ,Infectious diseases ,Female ,Pathogens ,Infants ,Research Article ,Adult ,medicine.medical_specialty ,Adolescent ,Anti-HIV Agents ,Birth weight ,030231 tropical medicine ,Viral diseases ,Microbiology ,Young Adult ,03 medical and health sciences ,Antenatal Care ,Retroviruses ,Parasitic Diseases ,medicine ,VIH (Virus) ,Humans ,Infant Health ,Microbial Pathogens ,Neonatologia ,business.industry ,HIV (Viruses) ,Lentivirus ,lcsh:R ,Infant, Newborn ,Organisms ,Biology and Life Sciences ,HIV ,Tropical Diseases ,medicine.disease ,Moçambic ,Infectious Disease Transmission, Vertical ,Parasitic Protozoans ,Malaria ,Age Groups ,People and Places ,Women's Health ,Population Groupings ,lcsh:Q ,Neonatology ,business - Abstract
INTRODUCTION: The HIV epidemic is concentrated in sub-Saharan Africa. However, limited information exists on its impact on women and infant's health since the introduction of antiretroviral drugs in this region, where health resources are often scarce. METHODS: The effect of HIV infection on maternal health, birth outcomes and infant health was analysed in two contemporary cohorts of HIV-uninfected and HIV-infected pregnant women from southern Mozambique. Pregnant women attending the first antenatal care visit were followed until one month after delivery. Antiretroviral therapy was administered based on CD4+T cell count and clinical stage. Maternal and neonatal morbidity and mortality, as well as pregnancy outcomes were assessed by mother's HIV status. RESULTS: A total of 1183 HIV-uninfected and 561 HIV-infected pregnant women were enrolled. HIV-infected women were more likely to have anaemia both at the first antenatal care visit and at delivery than HIV-uninfected women (71.5% versus 54.8% and 49.4% versus 40.6%, respectively, p
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- 2017
32. Tuberculosis prevalence after 4 years of population-wide systematic TB symptom screening and universal testing and treatment for HIV in the HPTN 071 (PopART) community-randomised trial in Zambia and South Africa: A cross-sectional survey (TREATS).
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Eveline Klinkenberg, Sian Floyd, Kwame Shanaube, Linda Mureithi, Thomas Gachie, Petra de Haas, Barry Kosloff, Peter J Dodd, Maria Ruperez, Chali Wapamesa, James Michael Burnett, Nico Kalisvaart, Nkatya Kasese, Redwaan Vermaak, Albertus Schaap, Sarah Fidler, Richard Hayes, Helen Ayles, and TREATS study team
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Medicine - Abstract
BackgroundTuberculosis (TB) prevalence remains persistently high in many settings, with new or expanded interventions required to achieve substantial reductions. The HIV Prevention Trials Network (HPTN) 071 (PopART) community-randomised trial randomised 14 communities to receive the "PopART" intervention during 2014 to 2017 (7 arm A and 7 arm B communities) and 7 communities to receive standard-of-care (arm C). The intervention was delivered door-to-door by community HIV care providers (CHiPs) and included universal HIV testing, facilitated linkage to HIV care at government health clinics, and systematic TB symptom screening. The Tuberculosis Reduction through Expanded Anti-retroviral Treatment and Screening (TREATS) study aimed to measure the impact of delivering the PopART intervention on TB outcomes, in communities with high HIV and TB prevalence.Methods and findingsThe study population of the HPTN 071 (PopART) trial included individuals aged ≥15 years living in 21 urban and peri-urban communities in Zambia and South Africa, with a total population of approximately 1 million and an adult HIV prevalence of around 15% at the time of the trial. Two sputum samples for TB testing were provided to CHiPs by individuals who reported ≥1 TB suggestive symptom (a cough for ≥2 weeks, unintentional weight loss ≥1.5 kg in the last month, or current night sweats) or that a household member was currently on TB treatment. Antiretroviral therapy (ART) was offered universally at clinics in arm A and according to local guidelines in arms B and C. The TREATS study was conducted in the same 21 communities as the HPTN 071 (PopART) trial between 2017 and 2022, and TB prevalence was a co-primary endpoint of the TREATS study. The primary comparison was between the PopART intervention (arms A and B combined) and the standard-of-care (arm C). During 2019 to 2021, a TB prevalence survey was conducted among randomly selected individuals aged ≥15 years (approximately 1,750 per community in arms A and B, approximately 3,500 in arm C). Participants were screened on TB symptoms and chest X-ray, with diagnostic testing using Xpert-Ultra followed by culture for individuals who screened positive. Sputum eligibility was determined by the presence of a cough for ≥2 weeks, or ≥2 of 5 "TB suggestive" symptoms (cough, weight loss for ≥4 weeks, night sweats, chest pain, and fever for ≥2 weeks), or chest X-ray CAD4TBv5 score ≥50, or no available X-ray results. TB prevalence was compared between trial arms using standard methods for cluster-randomised trials, with adjustment for age, sex, and HIV status, and multiple imputation was used for missing data on prevalent TB. Among 83,092 individuals who were eligible for the survey, 49,556 (59.6%) participated, 8,083 (16.3%) screened positive, 90.8% (7,336/8,083) provided 2 sputum samples for Xpert-Ultra testing, and 308 (4.2%) required culture confirmation. Overall, estimated TB prevalence was 0.92% (457/49,556). The geometric means of 7 community-level prevalence estimates were 0.91%, 0.70%, and 0.69% in arms A, B, and C, respectively, with no evidence of a difference comparing arms A and B combined with arm C (adjusted prevalence ratio 1.14, 95% confidence interval, CI [0.67, 1.95], p = 0.60). TB prevalence was higher among people living with HIV than HIV-negative individuals, with an age-sex-community adjusted odds ratio of 2.29 [95% CI 1.54, 3.41] in Zambian communities and 1.61 [95% CI 1.13, 2.30] in South African communities. The primary limitations are that the study was powered to detect only large reductions in TB prevalence in the intervention arm compared with standard-of-care, and the between-community variation in TB prevalence was larger than anticipated.ConclusionsThere was no evidence that the PopART intervention reduced TB prevalence. Systematic screening for TB that is based on symptom screening alone may not be sufficient to achieve a large reduction in TB prevalence over a period of several years. Including chest X-ray screening alongside TB symptom screening could substantially increase the sensitivity of systematic screening for TB.Trial registrationThe TREATS study was registered with ClinicalTrials.gov Identifier: NCT03739736 on November 14, 2018. The HPTN 071 (PopART) trial was registered at ClinicalTrials.gov under number NCT01900977 on July 17, 2013.
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- 2023
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33. Assessment of the safety of antimalarial drug use during early pregnancy (ASAP): protocol for a multicenter prospective cohort study in Burkina Faso, Kenya and Mozambique
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Andy Stergachis, Adama Kazienga, Innocent Valea, Hermann Sorgho, Orvalho Augusto, Meghna Desai, Gregory S. Calip, Anifa Vala, Umberto D'Alessandro, María Rupérez, Peter Ouma, Esperança Sevene, Stephanie Dellicour, Seydou Nakanabo-Diallo, Clara Menéndez, Eusebio Macete, Feiko O. ter Kuile, and Halidou Tinto
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Pediatrics ,Embaràs ,Cohort Studies ,Pharmacovigilance ,Study Protocol ,Clinical Protocols ,Pregnancy ,qv_771 ,Obstetrics and Gynaecology ,qv_256 ,Prospective Studies ,wq_200 ,Prospective cohort study ,Maternal-Fetal Exchange ,Medicina prenatal ,Pregnancy Outcome ,Obstetrics and Gynecology ,Artemisinins ,Estudi de casos ,Research Design ,Prenatal Exposure Delayed Effects ,Anti-infective agents ,Female ,ACTs ,Risk assessment ,Cohort study ,medicine.medical_specialty ,Agents antiinfecciosos ,Reproductive medicine ,Malària ,Gestational Age ,wa_395 ,Drug Administration Schedule ,Antimalarials ,Environmental health ,Prenatal medicine ,parasitic diseases ,medicine ,Humans ,business.industry ,Patient Selection ,Public health ,Infant, Newborn ,medicine.disease ,Malaria ,Pregnancy Trimester, First ,Reproductive Medicine ,Pregnancy Complications, Parasitic ,Sample Size ,Case studies ,business - Abstract
BACKGROUND: A major unresolved safety concern for malaria case management is the use of artemisinin combination therapies (ACTs) in the first trimester of pregnancy. There is a need for human data to inform policy makers and treatment guidelines on the safety of artemisinin combination therapies (ACT) when used during early pregnancy. METHODS: The overall goal of this paper is to describe the methods and implementation of a study aimed at developing surveillance systems for identifying exposures to antimalarials during early pregnancy and for monitoring pregnancy outcomes using health and demographic surveillance platforms. This was a multi-center prospective observational cohort study involving women at health and demographic surveillance sites in three countries in Africa: Burkina Faso, Kenya and Mozambique [(ClinicalTrials.gov Identifier: NCT01232530)]. The study was designed to identify pregnant women with artemisinin exposure in the first trimester and compare them to: 1) pregnant women without malaria, 2) pregnant women treated for malaria, but exposed to other antimalarials, and 3) pregnant women with malaria and treated with artemisinins in the 2nd or 3rd trimesters from the same settings. Pregnant women were recruited through community-based surveys and attendance at health facilities, including antenatal care clinics and followed until delivery. Data from the three sites will be pooled for analysis at the end of the study. Results are forthcoming. DISCUSSION: Despite few limitations, the methods described here are relevant to the development of sustainable pharmacovigilance systems for drugs used by pregnant women in the tropics using health and demographic surveillance sites to prospectively ascertain drug safety in early pregnancy. TRIAL REGISTRATION: NCT01232530.
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- 2015
34. Changing Trends in P. falciparum Burden, Immunity, and Disease in Pregnancy
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Sozinho Acácio, John J. Aponte, Azucena Bardají, Joseph J. Campo, Betuel Sigaúque, Laura de la Fuente, Leopoldina Luis, Alfons Jiménez, Eusebio Macete, Anifa Vala, Sonia Machevo, Pedro L. Alonso, María Rupérez, Abel Nhama, Esperanza Sevene, Pau Cisteró, Tacilta Nhampossa, Sonia Maculuve, Clara Menéndez, Raquel González, Ana Maria Fonseca, Chetan E. Chitnis, Arsenio Nhacolo, Alfredo Mayor, and Carlota Dobaño
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Adult ,Epidemiology ,Plasmodium falciparum ,Embaràs ,Immunology ,Antibodies, Protozoan ,Malària ,Parasite load ,Severity of Illness Index ,Immunoglobulin G ,Parasite Load ,Young Adult ,Cost of Illness ,Immunity ,Pregnancy ,Prevalence ,Parasite hosting ,Medicine ,Humans ,Immunologia ,Malaria, Falciparum ,Pregnancy Complications, Infectious ,Epidemiologia ,Mozambique ,biology ,business.industry ,General Medicine ,biology.organism_classification ,medicine.disease ,Virology ,Malaria ,Parity ,biology.protein ,Female ,Antibody ,business - Abstract
Background Prevention of reinfection and resurgence is an integral component of the goal to eradicate malaria. However, the adverse effects of malaria resurgences are not known. Methods We assessed the prevalence of Plasmodium falciparum infection among 1819 Mozambican women who delivered infants between 2003 and 2012. We used microscopic and histologic examination and a quantitative polymerase-chain-reaction (qPCR) assay, as well as flow-cytometric analysis of IgG antibody responses against two parasite lines. Results Positive qPCR tests for P. falciparum decreased from 33% in 2003 to 2% in 2010 and increased to 6% in 2012, with antimalarial IgG antibody responses mirroring these trends. Parasite densities in peripheral blood on qPCR assay were higher in 2010-2012 (geometric mean [+/-SD], 409+/-1569 genomes per microliter) than in 2003-2005 (44+/-169 genomes per microliter, P=0.02), as were parasite densities in placental blood on histologic assessment (50+/-39% of infected erythrocytes vs. 4+/-6%, P
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- 2015
35. Under treatment of pneumonia among children under 5 years of age in a malaria-endemic area: population-based surveillance study conducted in Manhica district- rural, Mozambique
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Betuel Sigaúque, Pedro Aide, Charfudin Sacoor, Miguel A. Lanaspa, Pedro L. Alonso, Tacilta Nhampossa, María Rupérez, Sozinho Acácio, Eusebio Macete, Brian D. Plikaytis, Tarayn Fairlie, and Jennifer R. Verani
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Male ,Rural Population ,Microbiology (medical) ,Pediatrics ,medicine.medical_specialty ,Malalties infeccioses en els infants ,Malària ,Pneumònia ,Comorbidity ,Drug Prescriptions ,Article ,lcsh:Infectious and parasitic diseases ,Ambulatory care ,Comorbiditat ,Risk Factors ,Ambulatory Care ,medicine ,Humans ,Outpatient clinic ,lcsh:RC109-216 ,Risk factor ,Referral and Consultation ,Mozambique ,Integrated Management of Childhood Illness ,Coinfection ,business.industry ,Infant ,General Medicine ,Emergency department ,Pneumonia ,Communicable diseases in children ,medicine.disease ,Moçambic ,humanities ,respiratory tract diseases ,Malaria ,Diagnosis of malaria ,Infectious Diseases ,Child, Preschool ,Population Surveillance ,Emergency medicine ,Female ,Guideline Adherence ,business - Abstract
BACKGROUND: Integrated Management of Childhood Illness (IMCI) guidelines were developed to decrease morbidity and mortality, yet implementation varies across settings. Factors associated with poor adherence are not well understood. METHODS: We used data from Manhica District Hospital outpatient department and five peripheral health centers to examine pneumonia management for children
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- 2015
36. Prevalence and risk factors of M tuberculosis infection in young people across 14 communities in Zambia and South Africa.
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Modupe Amofa-Sekyi, Ab Schaap, Linda Mureithi, Barry Kosloff, Maina Cheeba, Bxyn Kangololo, Redwaan Vermaak, Robynn Paulsen, Maria Ruperez, Sian Floyd, Petra de Haas, Sarah Fidler, Richard Hayes, Helen Ayles, Kwame Shanaube, and TREATS study team
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Public aspects of medicine ,RA1-1270 - Abstract
BackgroundFrom 2018-2021 the TB Reduction through Expanded Antiretroviral Treatment and TB Screening (TREATS) project took place in 21 Zambian and South African communities. The TREATS Incidence of TB Infection Cohort Study was conducted in adolescents and young people (AYP), aged 15-24 years in 14 communities. We describe the baseline prevalence and risk factors of Mycobacterium tuberculosis (M. tuberculosis) infection among this cohort and explore the quantitative QFT-Plus interferon gamma (IFN-γ) responses.Methods and findingsA random sample of approximately 300 AYP per community were recruited and information on TB/HIV risk factors, TB symptoms and social mixing patterns collected. QuantiFERON TB Gold Plus assay (QFT-Plus) was used to detect M. tuberculosis infection, following manufacturer's instructions. Logistic regression was used to determine factors associated with infection. 5577 eligible AYP were invited to participate across both countries, with 4648 enrolled. QFT-Plus results were available for 4529: 2552(Zambia) and 1977(South Africa). Overall, 47.6% (2156/4529) AYP had positive QFT-Plus results, the prevalence of infection in South Africa being twice that in Zambia (64.7% (1280/1977) vs 34.3% (867/2552) p0.6 IU/ml) of the assay at baseline showed no evidence of association with recent TB exposure.ConclusionThe high prevalence of infection in AYP warrants urgent action to address TB control, especially in South Africa. Further research is required to delineate antigen tube responses of the QFT-Plus assay more precisely to fully realise the benefit of the additional TB2 tube in high TB/HIV burden settings.
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- 2023
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37. Intermittent preventive treatment of malaria in pregnancy with mefloquine in HIV-infected women receiving cotrimoxazole prophylaxis: a multicenter randomized placebo-controlled trial
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Abdunoor M. Kabanywanyi, Arsenio Nhacolo, Peter Ouma, Raquel González, Meghna Desai, Anifa Vala, John Williamsom, María Rupérez, Laurence Slutsker, Salim Abdulla, Kephas Otieno, Abraham Katana, John J. Aponte, Esperança Sevene, Clara Menéndez, Alfredo Mayor, Golbahar Pahlavan, Eusebio Macete, Mwaka A. Kakolwa, Helder Bulo, and Sonia Maculuve
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medicine.medical_specialty ,education.field_of_study ,Intention-to-treat analysis ,business.industry ,Mefloquine ,Prevention ,Population ,lcsh:R ,Placebo-controlled study ,lcsh:Medicine ,Antenatal care ,General Medicine ,medicine.disease ,Surgery ,Tolerability ,Relative risk ,Internal medicine ,parasitic diseases ,Medicine ,business ,Adverse effect ,education ,Diagnosis & treatment ,Malaria ,medicine.drug - Abstract
BACKGROUND: Intermittent preventive treatment in pregnancy (IPTp) with sulfadoxine-pyrimethamine (SP) is recommended for malaria prevention in HIV-negative pregnant women, but it is contraindicated in HIV-infected women taking daily cotrimoxazole prophylaxis (CTXp) because of potential added risk of adverse effects associated with taking two antifolate drugs simultaneously. We studied the safety and efficacy of mefloquine (MQ) in women receiving CTXp and long-lasting insecticide treated nets (LLITNs). METHODS AND FINDINGS: A total of 1,071 HIV-infected women from Kenya, Mozambique, and Tanzania were randomized to receive either three doses of IPTp-MQ (15 mg/kg) or placebo given at least one month apart; all received CTXp and a LLITN. IPTp-MQ was associated with reduced rates of maternal parasitemia (risk ratio [RR], 0.47 [95% CI 0.27-0.82]; p=0.008), placental malaria (RR, 0.52 [95% CI 0.29-0.90]; p=0.021), and reduced incidence of non-obstetric hospital admissions (RR, 0.59 [95% CI 0.37-0.95]; p=0.031) in the intention to treat (ITT) analysis. There were no differences in the prevalence of adverse pregnancy outcomes between groups. Drug tolerability was poorer in the MQ group compared to the control group (29.6% referred dizziness and 23.9% vomiting after the first IPTp-MQ administration). HIV viral load at delivery was higher in the MQ group compared to the control group (p=0.048) in the ATP analysis. The frequency of perinatal mother to child transmission of HIV was increased in women who received MQ (RR, 1.95 [95% CI 1.14-3.33]; p=0.015). The main limitation of the latter finding relates to the exploratory nature of this part of the analysis. CONCLUSIONS: An effective antimalarial added to CTXp and LLITNs in HIV-infected pregnant women can improve malaria prevention, as well as maternal health through reduction in hospital admissions. However, MQ was not well tolerated, limiting its potential for IPTp and indicating the need to find alternatives with better tolerability to reduce malaria in this particularly vulnerable group. MQ was associated with an increased risk of mother to child transmission of HIV, which warrants a better understanding of the pharmacological interactions between antimalarials and antiretroviral drugs. TRIAL REGISTRATION: ClinicalTrials.gov NCT 00811421; Pan African Clinical Trials Registry PACTR 2010020001813440 Please see later in the article for the Editors' Summary.
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- 2014
38. Perceptions of malaria in pregnancy and acceptability of preventive interventions among Mozambican pregnant women: implications for effectiveness of malaria control in pregnancy
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Khátia Munguambe, Charfudin Sacoor, María Rupérez, Clara Menéndez, César Velasco, Helena Boene, Esperança Sevene, Eusebio Macete, Sonia Machevo, Anifa Vala, and Raquel González
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Rural Population ,Health Knowledge, Attitudes, Practice ,Mosquito Control ,Non-Clinical Medicine ,Epidemiology ,Ethnography ,Psychological intervention ,Indoor residual spraying ,lcsh:Medicine ,Social and Behavioral Sciences ,Health facility ,Pregnancy ,lcsh:Science ,Mozambique ,Multidisciplinary ,Obstetrics and Gynecology ,Prenatal Care ,Socioeconomic Aspects of Health ,Infectious Diseases ,Medicine ,Female ,Public Health ,Behavioral and Social Aspects of Health ,Research Article ,Adult ,medicine.medical_specialty ,Infectious Disease Control ,Adolescent ,Clinical Research Design ,Black People ,Prenatal care ,Interviews as Topic ,Antimalarials ,Young Adult ,Environmental health ,parasitic diseases ,Parasitic Diseases ,medicine ,Humans ,Insecticide-Treated Bednets ,Preventive healthcare ,Gynecology ,Survey Research ,business.industry ,lcsh:R ,Patient Acceptance of Health Care ,medicine.disease ,Malaria ,Survey Methods ,Anthropology ,Pregnancy Complications, Parasitic ,Women's Health ,Perception ,lcsh:Q ,Preventive Medicine ,Rural area ,business - Abstract
Background Intermittent Preventive Treatment (IPTp) and insecticide treated nets (ITNs) are recommended malaria in pregnancy preventive interventions in sub-Saharan Africa. Despite their cost-effectiveness and seemingly straight-forward delivery mechanism, their uptake remains low. We aimed at describing perceptions of pregnant women regarding malaria and the recommended prevention interventions to understand barriers to uptake and help to improve their effectiveness. Methods and findings We used mixed methods to collect data among 85 pregnant women from a rural area of Southern Mozambique. Information was obtained through observations, in-depth interviews, and focused ethnographic exercises (Free-listing and Pairwise comparisons). Thematic analysis was performed on qualitative data. Data from focused ethnographic exercises were summarized into frequency distribution tables and matrices. Malaria was not viewed as a threat to pregnancy. Participants were not fully aware of malaria- associated adverse maternal and birth outcomes. ITNs were the most preferred and used malaria preventive intervention, while IPTp fell between second and third. Indoor Residual Spraying (IRS) was the least preferred intervention. Conclusions Low awareness of the risks and adverse consequences of malaria in pregnancy did not seem to affect acceptability or uptake to the different malaria preventive interventions in the same manner. Perceived convenience, the delivery approach, and type of provider were the key factors. Pregnant women, through antenatal care (ANC) services, can be the vehicles of ITN distribution in the communities to maximise overall ITN coverage. There is a need to improve knowledge about neonatal health and malaria to improve uptake of interventions delivered through channels other than the health facility.
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- 2014
39. Young adolescent girls are at high risk for adverse pregnancy outcomes in sub-Saharan Africa: an observational multicountry study
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Arti Basra, Michel Cot, John J. Aponte, Abdunoor M Kabanywany, Ayola A. Adegnika, Michael Ramharter, Salim Abdulla, Anifa Vala, Seldiji T Agnandji, Rella Zoleko Manego, María Rupérez, Mwaka A. Kakolwa, Clara Menéndez, Smaïla Ouédraogo, Eusebio Macete, Maria Yazdanbakhsh, Ghyslain Mombo-Ngoma, Pierre-Blaise Matsiegui, Esperança Sevene, Jean Rodolphe Mackanga, Achille Massougbodji, Raquel González, and Peter G. Kremsner
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sub-Saharan Africa ,Pediatrics ,Embaràs ,Girls ,adolescent pregnancy ,Adolescents ,0302 clinical medicine ,Pregnancy ,Prospective Studies ,030212 general & internal medicine ,Reproductive health ,education.field_of_study ,Obstetrics ,Pregnancy Outcome ,General Medicine ,Premature birth ,Pregnancy in Adolescence ,Premature Birth ,Gestation ,Female ,Public Health ,medicine.symptom ,Live birth ,Àfrica subsahariana ,Infant, Premature ,Maternal Age ,Noies ,medicine.medical_specialty ,Adolescent ,Maternal-Child Health Services ,Birth weight ,030231 tropical medicine ,Population ,Health Promotion ,Teenagers ,03 medical and health sciences ,medicine ,Humans ,low birth weight ,education ,Africa South of the Sahara ,business.industry ,Research ,Infant, Newborn ,preterm birth ,Infant, Low Birth Weight ,medicine.disease ,Low birth weight ,business - Abstract
Objectives One of Africa's most important challenges is to improve maternal and neonatal health. The identification of groups at highest risk for adverse pregnancy outcomes is important for developing and implementing targeted prevention programmes. This study assessed whether young adolescent girls constitute a group at increased risk for adverse birth outcomes among pregnant women in sub-Saharan Africa. Setting Data were collected prospectively as part of a large randomised controlled clinical trial evaluating intermittent preventive treatment of malaria in pregnancy ([NCT00811421][1]—Clinical Trials.gov), conducted between September 2009 and December 2013 in Benin, Gabon, Mozambique and Tanzania. Participants Of 4749 participants, pregnancy outcomes were collected for 4388 deliveries with 4183 live births including 83 multiple gestations. Of 4100 mothers with a singleton live birth delivery, 24% (975/4100) were adolescents (≤19 years of age) and 6% (248/4100) were aged ≤16 years. Primary and secondary outcome measures Primary outcomes of this predefined analysis were preterm delivery and low birth weight. Results The overall prevalence of low birthweight infants and preterm delivery was 10% (371/3851) and 4% (159/3862), respectively. Mothers aged ≤16 years showed higher risk for the delivery of a low birthweight infant (OR: 1.96; 95% CI 1.35 to 2.83). Similarly, preterm delivery was associated with young maternal age (≤16 years; OR: 2.62; 95% CI 1.59 to 4.30). In a subanalysis restricted to primiparous women: preterm delivery, OR 4.28; 95% CI 2.05 to 8.93; low birth weight, OR: 1.29; 95% CI 0.82 to 2.01. Conclusions Young maternal age increases the risk for adverse pregnancy outcomes and it is a stronger predictor for low birth weight and preterm delivery than other established risk factors in sub-Saharan Africa. This finding highlights the need to improve adolescent reproductive health in sub-Saharan Africa. Trial registration number NCT00811421; Post-results. [1]: /lookup/external-ref?link_type=CLINTRIALGOV&access_num=NCT00811421&atom=%2Fbmjopen%2F6%2F6%2Fe011783.atom
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- 2016
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40. First trimester use of artemisinin-based combination therapy and the risk of low birth weight and small for gestational age
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Orvalho Augusto, Andy Stergachis, Stephanie Dellicour, Halidou Tinto, Anifa Valá, Maria Ruperez, Eusébio Macete, Seydou Nakanabo-Diallo, Adama Kazienga, Innocent Valéa, Umberto d’Alessandro, Feiko O. ter Kuile, Gregory S. Calip, Peter Ouma, Meghna Desai, and Esperança Sevene
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Low birth weight ,Small for gestational age ,Prospective cohort ,Artemisinins ,Sub-Saharan Africa ,Pharmacovigilance ,Arctic medicine. Tropical medicine ,RC955-962 ,Infectious and parasitic diseases ,RC109-216 - Abstract
Abstract Background While there is increasing evidence on the safety of artemisinin-based combination therapy (ACT) for the case management of malaria in early pregnancy, little is known about the association between exposure to ACT during the first trimester and the effect on fetal growth. Methods Data were analysed from prospective studies of pregnant women enrolled in Mozambique, Burkina Faso and Kenya designed to determine the association between anti-malarial drug exposure in the first trimester and pregnancy outcomes, including low birth weight (LBW) and small for gestational age (SGA). Exposure to anti-malarial drugs was ascertained retrospectively by record linkage using a combination of data collected from antenatal and adult outpatient clinic registries, prescription records and self-reported medication usage by the women. Site-level data synthesis (fixed effects and random effects) was conducted as well as individual-level analysis (fixed effects by site). Results Overall, 1915 newborns were included with 92 and 26 exposed to ACT (artemether–lumefantrine) and quinine, respectively. In Burkina Faso, Mozambique and Kenya at recruitment, the mean age (standard deviation) was 27.1 (6.6), 24.2 (6.2) and 25.7 (6.5) years, and the mean gestational age was 24.0 (6.2), 21.2 (5.7) and 17.9 (10.2) weeks, respectively. The LBW prevalence among newborns born to women exposed to ACT and quinine (QNN) during the first trimester was 10/92 (10.9%) and 7/26 (26.9%), respectively, compared to 9.5% (171/1797) among women unexposed to any anti-malarials during pregnancy. Compared to those unexposed to anti-malarials, ACT and QNN exposed women had the pooled LBW prevalence ratio (PR) of 1.13 (95% confidence interval (CI) 0.62–2.05, p-value 0.700) and 2.03 (95% CI 1.09–3.78, p-value 0.027), respectively. Compared to those unexposed to anti-malarials ACT and QNN-exposed women had the pooled SGA PR of 0.85 (95% CI 0.50–1.44, p-value 0.543) and 1.41 (95% CI 0.71–2.77, p-value 0.322), respectively. Whereas compared to ACT-exposed, the QNN-exposed had a PR of 2.14 (95% CI 0.78–5.89, p-value 0.142) for LBW and 8.60 (95% CI 1.29–57.6, p-value 0.027) for SGA. The level of between sites heterogeneity was moderate to high. Conclusion ACT exposure during the first trimester was not associated with an increased occurrence of LBW or SGA. However, the data suggest a higher prevalence of LBW and SGA for children born to QNN-exposed pregnancies. The findings support the use of ACT (artemether–lumefantrine) for the treatment of uncomplicated malaria during the first trimester of pregnancy.
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- 2020
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41. Intermittent Preventive Treatment of Malaria in Pregnancy with Mefloquine in HIV-Negative Women: A Multicentre Randomized Controlled Trial
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Anifa Vala, Abdunoor M. Kabanywanyi, Achille Massougbodgi, Michel Cot, Salim Abdulla, Daisy Akerey-Diop, Ghyslain Mombo-Ngoma, Golbahar Pahlavan, Smaïla Ouédraogo, Eusebio Macete, Valérie Briand, Jean-Rodolphe Mackanga, Peter G. Kremsner, Alfredo Mayor, Clara Menéndez, Esperança Sevene, Rella Zoleko-Manego, Mwaka A. Kakolwa, Raquel González, Arsenio Nhacolo, Christian Kleine, María Rupérez, John J. Aponte, Meskure Capan, Manfred Accrombessi, Arti Basra, and Michael Ramharter
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Pediatrics ,medicine.medical_specialty ,Pregnancy ,Mefloquine ,business.industry ,Incidence (epidemiology) ,Context (language use) ,General Medicine ,medicine.disease ,law.invention ,Tolerability ,Randomized controlled trial ,law ,Internal medicine ,Relative risk ,parasitic diseases ,medicine ,Medicine ,business ,Diagnosis & treatment ,Cohort study ,medicine.drug - Abstract
BackgroundIntermittent preventive treatment in pregnancy (IPTp) with sulfadoxine-pyrimethamine (SP) is recommended by WHO to prevent malaria in African pregnant women. The spread of SP parasite resistance has raised concerns regarding long-term use for IPT. Mefloquine (MQ) is the most promising of available alternatives to SP based on safety profile, long half-life, and high efficacy in Africa. We evaluated the safety and efficacy of MQ for IPTp compared to those of SP in HIV-negative women.Methods and findingsA total of 4,749 pregnant women were enrolled in an open-label randomized clinical trial conducted in Benin, Gabon, Mozambique, and Tanzania comparing two-dose MQ or SP for IPTp and MQ tolerability of two different regimens. The study arms were: (1) SP, (2) single dose MQ (15 mg/kg), and (3) split-dose MQ in the context of long lasting insecticide treated nets. There was no difference on low birth weight prevalence (primary study outcome) between groups (360/2,778 [13.0%]) for MQ group and 177/1,398 (12.7%) for SP group; risk ratio [RR], 1.02 (95% CI 0.86-1.22; p=0.80 in the ITT analysis). Women receiving MQ had reduced risks of parasitemia (63/1,372 [4.6%] in the SP group and 88/2,737 [3.2%] in the MQ group; RR, 0.70 [95% CI 0.51-0.96]; p=0.03) and anemia at delivery (609/1,380 [44.1%] in the SP group and 1,110/2743 [40.5%] in the MQ group; RR, 0.92 [95% CI 0.85-0.99]; p=0.03), and reduced incidence of clinical malaria (96/551.8 malaria episodes person/year [PYAR] in the SP group and 130/1,103.2 episodes PYAR in the MQ group; RR, 0.67 [95% CI 0.52-0.88]; p=0.004) and all-cause outpatient attendances during pregnancy (850/557.8 outpatients visits PYAR in the SP group and 1,480/1,110.1 visits PYAR in the MQ group; RR, 0.86 [0.78-0.95]; p=0.003). There were no differences in the prevalence of placental infection and adverse pregnancy outcomes between groups. Tolerability was poorer in the two MQ groups compared to SP. The most frequently reported related adverse events were dizziness (ranging from 33.9% to 35.5% after dose 1; and 16.0% to 20.8% after dose 2) and vomiting (30.2% to 31.7%, after dose 1 and 15.3% to 17.4% after dose 2) with similar proportions in the full and split MQ arms. The open-label design is a limitation of the study that affects mainly the safety assessment.ConclusionsWomen taking MQ IPTp (15 mg/kg) in the context of long lasting insecticide treated nets had similar prevalence rates of low birth weight as those taking SP IPTp. MQ recipients had less clinical malaria than SP recipients, and the pregnancy outcomes and safety profile were similar. MQ had poorer tolerability even when splitting the dose over two days. These results do not support a change in the current IPTp policy.Trial registrationClinicalTrials.gov NCT 00811421; Pan African Clinical Trials Registry PACTR 2010020001429343 Please see later in the article for the Editors' Summary.
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- 2014
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42. Assessing usability of QIAreach QuantiFERON-TB platform in a high tuberculosis prevalence, low-resource setting
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Conceptor Kaaba, Maria Ruperez, Barry Kosloff, Nduku Ndunda, Kwame Shanaube, and Helen Ayles
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Medicine - Published
- 2021
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43. VAR2CSA Serology to Detect Plasmodium falciparum Transmission Patterns in Pregnancy
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Ana Maria Fonseca, Raquel González, Azucena Bardají, Chenjerai Jairoce, Maria Rupérez, Alfons Jiménez, Llorenç Quintó, Pau Cisteró, Anifa Vala, Charfudin Sacoor, Himanshu Gupta, Jennifer Hegewisch-Taylor, Joe Brew, Nicaise Tuikue Ndam, Simon Kariuki, Marta López, Carlota Dobaño, Chetan E. Chitnis, Peter Ouma, Michael Ramharter, Salim Abdulla, John J. Aponte, Achille Massougbodji, Valerie Briand, Ghyslain Mombo-Ngoma, Meghna Desai, Michel Cot, Arsenio Nhacolo, Esperança Sevene, Eusebio Macete, Clara Menéndez, and Alfredo Mayor
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Malaria ,pregnancy ,serology ,transmission ,exposure ,immunity ,Medicine ,Infectious and parasitic diseases ,RC109-216 - Abstract
Pregnant women constitute a promising sentinel group for continuous monitoring of malaria transmission. To identify antibody signatures of recent Plasmodium falciparum exposure during pregnancy, we dissected IgG responses against VAR2CSA, the parasite antigen that mediates placental sequestration. We used a multiplex peptide-based suspension array in 2,354 samples from pregnant women from Mozambique, Benin, Kenya, Gabon, Tanzania, and Spain. Two VAR2CSA peptides of limited polymorphism were immunogenic and targeted by IgG responses readily boosted during infection and with estimated half-lives of
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- 2019
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44. Community-based active case-finding interventions for tuberculosis: a systematic review
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Rachael M Burke, MRCP, Marriott Nliwasa, PhD, Helena R A Feasey, MSc, Lelia H Chaisson, PhD, Jonathan E Golub, ProfPhD, Fahd Naufal, MD, Adrienne E Shapiro, PhD, Maria Ruperez, PhD, Lily Telisinghe, MRCP, Helen Ayles, ProfPhD, Elizabeth L Corbett, ProfFMedSci, and Peter MacPherson, PhD
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Public aspects of medicine ,RA1-1270 - Abstract
Summary: Background: Community-based active case-finding interventions might identify and treat more people with tuberculosis disease than standard case detection. We aimed to assess whether active case-finding interventions can affect tuberculosis epidemiology in the wider community. Methods: We did a systematic review by searching PubMed, Embase, Scopus, and Cochrane Library for studies that compared tuberculosis case notification rates, tuberculosis disease prevalence, or tuberculosis infection prevalence or incidence in children, between populations exposed and unexposed to active case-finding interventions. We included studies published in English between Jan 1, 1980, and April 13, 2020. Studies of active case-finding in the general population, in populations perceived to be at high risk for tuberculosis, and in closed settings were included, whereas studies of tuberculosis screening at health-care facilities, among household contacts, or among children only, and studies that screened fewer than 1000 people were excluded. To estimate effectiveness, we extracted or calculated case notification rates, prevalence of tuberculosis disease, and incidence or prevalence of tuberculosis infection in children, and compared ratios of these outcomes between groups that were exposed or not exposed to active case-finding interventions. Results: 27 883 abstracts were screened and 988 articles underwent full text review. 28 studies contributed data for analysis of tuberculosis case notifications, nine for prevalence of tuberculosis disease, and two for incidence or prevalence of tuberculosis infection in children. In one cluster-randomised trial in South Africa and Zambia, an active case-finding intervention based on community mobilisation and sputum drop-off did not affect tuberculosis prevalence, whereas, in a cluster-randomised trial in Vietnam, an active case-finding intervention based on sputum tuberculosis tests for everyone reduced tuberculosis prevalence in the community. We found inconsistent, low-quality evidence that active case-finding might increase the number of cases of tuberculosis notified in populations with structural risk factors for tuberculosis. Interpretation: Community-based active case-finding for tuberculosis might be effective in changing tuberculosis epidemiology and thereby improving population health if delivered with high coverage and intensity. If possible, active case-finding projects should incorporate a well designed, robust evaluation to contribute to the evidence base and help elucidate which delivery methods and diagnostic strategies are most effective. Funding: WHO Global TB Programme.
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- 2021
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45. Do community-based active case-finding interventions have indirect impacts on wider TB case detection and determinants of subsequent TB testing behaviour? A systematic review.
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Helena R A Feasey, Rachael M Burke, Marriott Nliwasa, Lelia H Chaisson, Jonathan E Golub, Fahd Naufal, Adrienne E Shapiro, Maria Ruperez, Lily Telisinghe, Helen Ayles, Cecily Miller, Helen E D Burchett, Peter MacPherson, and Elizabeth L Corbett
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Public aspects of medicine ,RA1-1270 - Abstract
Community-based active case-finding (ACF) may have important impacts on routine TB case-detection and subsequent patient-initiated diagnosis pathways, contributing "indirectly" to infectious diseases prevention and care. We investigated the impact of ACF beyond directly diagnosed patients for TB, using routine case-notification rate (CNR) ratios as a measure of indirect effect. We systematically searched for publications 01-Jan-1980 to 13-Apr-2020 reporting on community-based ACF interventions compared to a comparison group, together with review of linked manuscripts reporting knowledge, attitudes, and practices (KAP) outcomes or qualitative data on TB testing behaviour. We calculated CNR ratios of routine case-notifications (i.e. excluding cases identified directly through ACF) and compared proxy behavioural outcomes for both ACF and comparator communities. Full text manuscripts from 988 of 23,883 abstracts were screened for inclusion; 36 were eligible. Of these, 12 reported routine notification rates separately from ACF intervention-attributed rates, and one reported any proxy behavioural outcomes. Two further studies were identified from screening 1121 abstracts for linked KAP/qualitative manuscripts. 8/12 case-notification studies were considered at critical or serious risk of bias. 8/11 non-randomised studies reported bacteriologically-confirmed CNR ratios between 0.47 (95% CI:0.41-0.53) and 0.96 (95% CI:0.94-0.97), with 7/11 reporting all-form CNR ratios between 0.96 (95% CI:0.88-1.05) and 1.09 (95% CI:1.02-1.16). One high-quality randomised-controlled trial reported a ratio of 1.14 (95% CI 0.91-1.43). KAP/qualitative manuscripts provided insufficient evidence to establish the impact of ACF on subsequent TB testing behaviour. ACF interventions with routine CNR ratios >1 suggest an indirect effect on wider TB case-detection, potentially due to impact on subsequent TB testing behaviour through follow-up after a negative ACF test or increased TB knowledge. However, data on this type of impact are rarely collected. Evaluation of routine case-notification, testing and proxy behavioural outcomes in intervention and comparator communities should be included as standard methodology in future ACF campaign study designs.
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- 2021
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46. Under treatment of pneumonia among children under 5 years of age in a malaria-endemic area: population-based surveillance study conducted in Manhica district- rural, Mozambique
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Sozinho Acácio, Jennifer R. Verani, Miguel Lanaspa, Tarayn A. Fairlie, Tacilta Nhampossa, Maria Ruperez, Pedro Aide, Brian D. Plikaytis, Charfudin Sacoor, Eusebio Macete, Pedro Alonso, and Betuel Sigaúque
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Pneumonia ,Mozambique ,Guideline Adherence ,Infectious and parasitic diseases ,RC109-216 - Abstract
Background: Integrated Management of Childhood Illness (IMCI) guidelines were developed to decrease morbidity and mortality, yet implementation varies across settings. Factors associated with poor adherence are not well understood. Methods: We used data from Manhiça District Hospital outpatient department and five peripheral health centers to examine pneumonia management for children
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- 2015
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47. First-trimester artemisinin derivatives and quinine treatments and the risk of adverse pregnancy outcomes in Africa and Asia: A meta-analysis of observational studies.
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Stephanie Dellicour, Esperança Sevene, Rose McGready, Halidou Tinto, Dominic Mosha, Christine Manyando, Stephen Rulisa, Meghna Desai, Peter Ouma, Martina Oneko, Anifa Vala, Maria Rupérez, Eusébio Macete, Clara Menéndez, Seydou Nakanabo-Diallo, Adama Kazienga, Innocent Valéa, Gregory Calip, Orvalho Augusto, Blaise Genton, Eric M Njunju, Kerryn A Moore, Umberto d'Alessandro, Francois Nosten, Feiko Ter Kuile, and Andy Stergachis
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Medicine - Abstract
BackgroundAnimal embryotoxicity data, and the scarcity of safety data in human pregnancies, have prevented artemisinin derivatives from being recommended for malaria treatment in the first trimester except in lifesaving circumstances. We conducted a meta-analysis of prospective observational studies comparing the risk of miscarriage, stillbirth, and major congenital anomaly (primary outcomes) among first-trimester pregnancies treated with artemisinin derivatives versus quinine or no antimalarial treatment.Methods and findingsElectronic databases including Medline, Embase, and Malaria in Pregnancy Library were searched, and investigators contacted. Five studies involving 30,618 pregnancies were included; four from sub-Saharan Africa (n = 6,666 pregnancies, six sites) and one from Thailand (n = 23,952). Antimalarial exposures were ascertained by self-report or active detection and confirmed by prescriptions, clinic cards, and outpatient registers. Cox proportional hazards models, accounting for time under observation and gestational age at enrollment, were used to calculate hazard ratios. Individual participant data (IPD) meta-analysis was used to combine the African studies, and the results were then combined with those from Thailand using aggregated data meta-analysis with a random effects model. There was no difference in the risk of miscarriage associated with the use of artemisinins anytime during the first trimester (n = 37/671) compared with quinine (n = 96/945; adjusted hazard ratio [aHR] = 0.73 [95% CI 0.44, 1.21], I2 = 0%, p = 0.228), in the risk of stillbirth (artemisinins, n = 10/654; quinine, n = 11/615; aHR = 0.29 [95% CI 0.08-1.02], p = 0.053), or in the risk of miscarriage and stillbirth combined (pregnancy loss) (aHR = 0.58 [95% CI 0.36-1.02], p = 0.099). The corresponding risks of miscarriage, stillbirth, and pregnancy loss in a sensitivity analysis restricted to artemisinin exposures during the embryo sensitive period (6-12 wk gestation) were as follows: aHR = 1.04 (95% CI 0.54-2.01), I2 = 0%, p = 0.910; aHR = 0.73 (95% CI 0.26-2.06), p = 0.551; and aHR = 0.98 (95% CI 0.52-2.04), p = 0.603. The prevalence of major congenital anomalies was similar for first-trimester artemisinin (1.5% [95% CI 0.6%-3.5%]) and quinine exposures (1.2% [95% CI 0.6%-2.4%]). Key limitations of the study include the inability to control for confounding by indication in the African studies, the paucity of data on potential confounders, the limited statistical power to detect differences in congenital anomalies, and the lack of assessment of cardiovascular defects in newborns.ConclusionsCompared to quinine, artemisinin treatment in the first trimester was not associated with an increased risk of miscarriage or stillbirth. While the data are limited, they indicate no difference in the prevalence of major congenital anomalies between treatment groups. The benefits of 3-d artemisinin combination therapy regimens to treat malaria in early pregnancy are likely to outweigh the adverse outcomes of partially treated malaria, which can occur with oral quinine because of the known poor adherence to 7-d regimens.Review registrationPROSPERO CRD42015032371.
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- 2017
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48. Multiplexing detection of IgG against Plasmodium falciparum pregnancy-specific antigens.
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Ana Maria Fonseca, Llorenç Quinto, Alfons Jiménez, Raquel González, Azucena Bardají, Sonia Maculuve, Carlota Dobaño, Maria Rupérez, Anifa Vala, John J Aponte, Esperanza Sevene, Eusebio Macete, Clara Menéndez, and Alfredo Mayor
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Medicine ,Science - Abstract
Pregnant women exposed to Plasmodium falciparum generate antibodies against VAR2CSA, the parasite protein that mediates adhesion of infected erythrocytes to the placenta. There is a need of high-throughput tools to determine the fine specificity of these antibodies that can be used to identify immune correlates of protection and exposure. Here we aimed at developing a multiplex-immunoassay to detect antibodies against VAR2CSA antigens.We constructed two multiplex-bead arrays, one composed of 3 VAR2CSA recombinant-domains (DBL3X, DBL5Ɛ and DBL6Ɛ) and another composed of 46 new peptides covering VAR2CSA conserved and semi-conserved regions. IgG reactivity was similar in multiplexed and singleplexed determinations (Pearson correlation, protein array: R2 = 0.99 and peptide array: R2 = 0.87). IgG recognition of 25 out of 46 peptides and all recombinant-domains was higher in pregnant Mozambican women (n = 106) than in Mozambican men (n = 102) and Spanish individuals (n = 101; p
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- 2017
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49. Interferon-γ-Inducible Protein 10 (IP-10) as a Screening Tool to Optimize Human Immunodeficiency Virus RNA Monitoring in Resource-Limited Settings
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Chenjerai Jairoce, Aina Casellas, Jorge Carrillo, María Rupérez, Denise Naniche, Sonia Maculuve, Julià Blanco, Roger Paredes, and Lucía Pastor
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0301 basic medicine ,sub-Saharan Africa ,Male ,global health ,HIV Infections ,Sub-saharan Africa ,Scale-up viral load ,Immunitat cel·lular ,Citoquines ,Medicine ,Articles and Commentaries ,Mozambique ,Area under the curve ,Viral Load ,Cellular immunity ,Infectious Diseases ,Treatment Outcome ,Anti-Retroviral Agents ,Biomarker (medicine) ,RNA, Viral ,Cytokines ,Female ,Viral load ,Microbiology (medical) ,Adult ,medicine.medical_specialty ,Implementation research ,030106 microbiology ,Global health ,Viremia ,03 medical and health sciences ,implementation research ,Internal medicine ,Humans ,scale-up viral load ,Receiver operating characteristic ,business.industry ,Gold standard (test) ,medicine.disease ,Virology ,Confidence interval ,cytokines ,Chemokine CXCL10 ,030104 developmental biology ,Cross-Sectional Studies ,ROC Curve ,Mann–Whitney U test ,HIV-1 ,business - Abstract
Interferon-γ–inducible protein-10 is an affordable and easily quantifiable biomarker that can be used to accurately screen individuals on antiretroviral treatment (ART) for detectable viremia, optimizing the use of costly viral load determinations required to monitor ART in low-income countries., Background Achieving effective antiretroviral treatment (ART) monitoring is a key determinant to ensure viral suppression and reach the UNAIDS 90-90-90 targets. The gold standard for detecting virological failure is plasma human immunodeficiency virus (HIV) RNA (viral load [VL]) testing; however, its availability is very limited in low-income countries due to cost and operational constraints. Methods HIV-1–infected adults on first-line ART attending routine visits at the Manhiça District Hospital, Mozambique, were previously evaluated for virologic failure. Plasma levels of interferon-γ–inducible protein 10 (IP-10) were quantified by enzyme-linked immunosorbent assay. Logistic regression was used to build an IP-10–based model able to identify individuals with VL >150 copies/mL. From the 316 individuals analyzed, 253 (80%) were used for model training and 63 (20%) for validation. Receiver operating characteristic curves were employed to evaluate model prediction. Results From the individuals included in the training set, 34% had detectable VL. Mean age was 41 years, 70% were females, and median time on ART was 3.4 years. IP-10 levels were significantly higher in subjects with detectable VL (108.2 pg/mL) as compared to those with undetectable VL (38.0 pg/mL) (P < .0001, U test). IP-10 univariate model demonstrated high classification performance (area under the curve = 0.85 [95% confidence interval {CI}, .80–.90]). Using a cutoff value of IP-10 ≥44.2 pg/mL, the model identified detectable VL with 91.9% sensitivity (95% CI, 83.9%–96.7%) and 59.9% specificity (95% CI, 52.0%–67.4%), values confirmed in the validation set. Conclusions IP-10 is an accurate biomarker to screen individuals on ART for detectable viremia. Further studies should evaluate the benefits of IP-10 as a triage approach to monitor ART in resource-limited settings.
50. First-trimester artemisinin derivatives and quinine treatments and the risk of adverse pregnancy outcomes in Africa and Asia: A meta-analysis of observational studies
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Eusebio Macete, Feiko O. ter Kuile, François Nosten, Esperança Sevene, Peter Ouma, Andy Stergachis, Innocent Valea, Orvalho Augusto, Umberto D'Alessandro, Eric M. Njunju, Christine Manyando, Adama Kazienga, Stephen Rulisa, Gregory S. Calip, Anifa Vala, Stephanie Dellicour, Kerryn A. Moore, Halidou Tinto, Meghna Desai, Rose McGready, Dominic Mosha, Clara Menéndez, Blaise Genton, María Rupérez, Martina Oneko, and Seydou Nakanabo-Diallo
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Artemether/lumefantrine ,Maternal Health ,Embaràs ,Antenatal care ,Miscarriage ,chemistry.chemical_compound ,Mathematical and Statistical Techniques ,0302 clinical medicine ,Pregnancy ,Prevalence ,Medicine and Health Sciences ,030212 general & internal medicine ,Artemisinin ,Asia, Southeastern ,Diagnosis & treatment ,Quinine ,Obstetrics ,Hazard ratio ,Abnormalities, Drug-Induced ,Obstetrics and Gynecology ,Gestational age ,Drugs ,General Medicine ,Stillbirth ,Congenital Anomalies ,Artemisinins ,3. Good health ,Observational Studies as Topic ,Chemistry ,Physical Sciences ,Medicine ,Female ,Statistics (Mathematics) ,Stillbirths ,Medicaments ,Research Article ,medicine.drug ,medicine.medical_specialty ,030231 tropical medicine ,Malària ,Research and Analysis Methods ,Risk Assessment ,Antimalarials ,03 medical and health sciences ,Alkaloids ,Parasitic Diseases ,Congenital Disorders ,medicine ,Humans ,Statistical Methods ,Africa South of the Sahara ,Pharmacology ,business.industry ,Chemical Compounds ,Tropical Diseases ,medicine.disease ,Surgery ,Malaria ,Abortion, Spontaneous ,Pregnancy Complications ,Pregnancy Trimester, First ,chemistry ,Artesunate ,Women's Health ,business ,Mathematics ,Meta-Analysis - Abstract
Background Animal embryotoxicity data, and the scarcity of safety data in human pregnancies, have prevented artemisinin derivatives from being recommended for malaria treatment in the first trimester except in lifesaving circumstances. We conducted a meta-analysis of prospective observational studies comparing the risk of miscarriage, stillbirth, and major congenital anomaly (primary outcomes) among first-trimester pregnancies treated with artemisinin derivatives versus quinine or no antimalarial treatment. Methods and findings Electronic databases including Medline, Embase, and Malaria in Pregnancy Library were searched, and investigators contacted. Five studies involving 30,618 pregnancies were included; four from sub-Saharan Africa (n = 6,666 pregnancies, six sites) and one from Thailand (n = 23,952). Antimalarial exposures were ascertained by self-report or active detection and confirmed by prescriptions, clinic cards, and outpatient registers. Cox proportional hazards models, accounting for time under observation and gestational age at enrollment, were used to calculate hazard ratios. Individual participant data (IPD) meta-analysis was used to combine the African studies, and the results were then combined with those from Thailand using aggregated data meta-analysis with a random effects model. There was no difference in the risk of miscarriage associated with the use of artemisinins anytime during the first trimester (n = 37/671) compared with quinine (n = 96/945; adjusted hazard ratio [aHR] = 0.73 [95% CI 0.44, 1.21], I2 = 0%, p = 0.228), in the risk of stillbirth (artemisinins, n = 10/654; quinine, n = 11/615; aHR = 0.29 [95% CI 0.08–1.02], p = 0.053), or in the risk of miscarriage and stillbirth combined (pregnancy loss) (aHR = 0.58 [95% CI 0.36–1.02], p = 0.099). The corresponding risks of miscarriage, stillbirth, and pregnancy loss in a sensitivity analysis restricted to artemisinin exposures during the embryo sensitive period (6–12 wk gestation) were as follows: aHR = 1.04 (95% CI 0.54–2.01), I2 = 0%, p = 0.910; aHR = 0.73 (95% CI 0.26–2.06), p = 0.551; and aHR = 0.98 (95% CI 0.52–2.04), p = 0.603. The prevalence of major congenital anomalies was similar for first-trimester artemisinin (1.5% [95% CI 0.6%–3.5%]) and quinine exposures (1.2% [95% CI 0.6%–2.4%]). Key limitations of the study include the inability to control for confounding by indication in the African studies, the paucity of data on potential confounders, the limited statistical power to detect differences in congenital anomalies, and the lack of assessment of cardiovascular defects in newborns. Conclusions Compared to quinine, artemisinin treatment in the first trimester was not associated with an increased risk of miscarriage or stillbirth. While the data are limited, they indicate no difference in the prevalence of major congenital anomalies between treatment groups. The benefits of 3-d artemisinin combination therapy regimens to treat malaria in early pregnancy are likely to outweigh the adverse outcomes of partially treated malaria, which can occur with oral quinine because of the known poor adherence to 7-d regimens. Review registration PROSPERO CRD42015032371, In a meta-analysis using individual patient data from prospective observational studies, Andy Stergachis and colleagues investigate the risk of of miscarriage, stillbirth, and major congenital anomaly among pregnancies that were treated during the first trimester with artemisinin derivatives versus quinine or no antimalarial treatment., Author summary Why was this study done? Malaria infection is more frequent and severe in pregnant women compared to non-pregnant women, and the adverse consequences of malaria in pregnancy require prompt, safe, and effective treatment. Artemisinin combination therapies (ACTs), the most efficacious antimalarials available, are the recommended first-line treatment for Plasmodium falciparum malaria. Animal embryotoxicity data and the paucity of safety data in human pregnancies have prevented artemisinin derivatives from being recommended for malaria treatment in the first trimester except in life-saving circumstances, yet in malaria endemic countries, many early pregnancies are advertently or inadvertently exposed to ACTs. In this meta-analysis of prospective observational studies, we summarize all available safety data on the effect of artemisinin exposure in the first trimester and compare the risk of miscarriage, stillbirth, and major congenital anomaly for pregnancies treated with artemisinin, quinine, or no antimalarials in the first trimester. What did the researchers do and find? Our team determined the risk of miscarriages, stillbirths, and major congenital anomalies associated with first-trimester artemisinin treatment versus quinine in four independent prospective observational studies across six sites in sub-Saharan Africa using individual participant data meta-analysis. The results were then combined with summary effect estimates from the Shoklo Malaria Research Unit on the Thailand–Myanmar border using aggregated data meta-analysis. We found no difference in the risk of miscarriage, stillbirth, or major congenital anomalies associated with the use of artemisinins anytime during the first trimester compared with the use of quinine during the same gestational period. What do these findings mean? The ACT class of antimalarials should be considered for treatment of malaria in the first trimester of pregnancy. The limited data on the risk of congenital anomalies require further observational studies.
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