113 results on '"Newton Kumwenda"'
Search Results
102. Response to Letter, 'Unexplained High HIV-1 Incidence in a Cohort of Malawi Men'
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Newton Kumwenda, Taha E. Taha, and David D. Celentano
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Microbiology (medical) ,Pediatrics ,medicine.medical_specialty ,Infectious Diseases ,business.industry ,Incidence (epidemiology) ,Cohort ,Public Health, Environmental and Occupational Health ,Human immunodeficiency virus (HIV) ,Medicine ,Dermatology ,business ,medicine.disease_cause - Published
- 2003
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103. Morbidity Among Human Immunodeficiency Virus-1-Infected and -Uninfected African Children
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Diane Markakis, George N. Liomba, Stephen M. Graham, Donald R. Hoover, John D. Chiphangwi, Robin L. Broadhead, Paolo G. Miotti, Len van der Hoeven, Newton Kumwenda, and Taha E. Taha
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Diarrhea ,Male ,Pediatrics ,medicine.medical_specialty ,Fever ,Population ,CD4-CD8 Ratio ,Dermatitis ,Comorbidity ,Asymptomatic ,Measles ,Age Distribution ,Acquired immunodeficiency syndrome (AIDS) ,Candidiasis, Oral ,T-Lymphocyte Subsets ,medicine ,Humans ,Otitis ,education ,Prospective cohort study ,Proportional Hazards Models ,Acquired Immunodeficiency Syndrome ,education.field_of_study ,business.industry ,Infant ,medicine.disease ,Survival Analysis ,Infectious Disease Transmission, Vertical ,Survival Rate ,Vaccination ,Child mortality ,Cough ,Child, Preschool ,Africa ,Chronic Disease ,Pediatrics, Perinatology and Child Health ,HIV-1 ,Oral thrush ,Female ,medicine.symptom ,business ,Follow-Up Studies - Abstract
Objective. To assess patterns of morbidity and associated factors in late infancy and early childhood among human immunodeficiency virus (HIV)-infected and -uninfected African children. Design. Prospective study. Setting. The Queen Elizabeth Central Hospital, Blantyre, Malawi. Participants. Children with known HIV status from an earlier perinatal intervention trial were enrolled during the first year of life and followed to ∼36 months of age. Outcome Measures. Morbidity and mortality information was collected every 3 months by a questionnaire. A physical examination was conducted every 6 months. Blood to determine CD4+ values was also collected. Age-adjusted and Kaplan-Meier analyses were performed to compare rates of morbidity and mortality among infected and uninfected children. Results. Overall, 808 children (190 HIV-infected, 499 HIV-uninfected but born to infected mothers, and 119 born to HIV-uninfected mothers) were included in this study. Of these, 109 died during a median follow-up of 18 months. Rates of childhood immunizations were high among all children (eg, lowest was measles vaccination [87%] among HIV-infected children). Age-adjusted morbidity rates were significantly higher among HIV-infected than among HIV-uninfected children. HIV-infected children were more immunosuppressed than were uninfected children. By 3 years of age, 89% of the infected children died, 10% were in HIV disease category B or C, and only ∼1% were without HIV symptoms. Among HIV-infected children, median survival after the first occurrence of acquired immunodeficiency syndrome-related conditions, such as splenomegaly, oral thrush, and developmental delay, was Conclusions. The frequency of diseases was high, and progression from asymptomatic or symptomatic HIV disease to death was rapid. Management strategies that effectively reduce morbidity for HIV-infected children are needed.
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- 2000
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104. TRANSMISSION OF HIV-1 BY BREAST-FEEDING
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E T Taha, Richard D. Semba, Newton Kumwenda, J Chipangwi, Robert J. Biggar, and Paolo G. Miotti
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Transmission (mechanics) ,law ,business.industry ,Virology ,Immunology ,Human immunodeficiency virus (HIV) ,medicine ,Immunology and Allergy ,medicine.disease_cause ,business ,Breast feeding ,law.invention - Published
- 1999
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105. Comparison of LigAmp and an ASPCR Assay for Detection and Quantification of K103N-Containing HIV Variants.
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Jessica D. Church, William I. Towler, Donald R. Hoover, Sarah E. Hudelson, Newton Kumwenda, Taha E. Taha, James R. Eshleman, and Susan H. Eshleman
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ABSTRACTWe compared the ability of the LigAmp assay and an ASPCR assay to detect and quantify K103N-containing HIV variants in samples from 63 women who received single-dose nevirapine in a clinical trial. Samples were first analyzed with the ViroSeq HIV Genotyping system, and ViroSeq PCR products were used as templates for the LigAmp and ASPCR assays. A cutoff of 0.5 K103N for detection of K103N was used for both assays. Results for the percentage K103N were similar for the two assays (R2 0.92). Forty-six samples (73.0) were positive for K103N by both assays and 13 samples (20.6) were negative by both assays. Four samples (6.3) were positive by ASPCR only. No samples were positive by LigAmp only. Eight discordant samples were analyzed in more detail. Sequence polymorphisms near oligonucleotide binding sites provided a possible explanation for the discordance in four of eight samples. The percentage K103N was also determined by analyzing 40 HIV clones from each of these eight samples, using a combined amplification/sequencing method (AmpliSeq). The percentage K103N determined by clonal analysis was consistent with the LigAmp result for five of eight samples, and was consistent with the ASPCR result for three of eight samples. Among 320 clones analyzed, we identified eight different codons at position 103 (mean 3.8 codons/sample), which encoded six different amino acids, illustrating the extensive genetic diversity in HIV. Further studies are needed to compare performance of assays for detection and quantification of HIV drug resistance mutations in clinical samples. [ABSTRACT FROM AUTHOR]
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- 2008
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106. Short CommunicationHIV Type 1 Variants with Nevirapine Resistance Mutations Are Rarely Detected in Antiretroviral Drug-Naive African Women with Subtypes A, C, and D.
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Jessica D. Church, Sarah E. Hudelson, Laura A. Guay, Shu Chen, Donald R. Hoover, Neil Parkin, Susan A. Fiscus, Francis Mmiro, Philippa Musoke, Newton Kumwenda, J. Brooks Jackson, Taha E. Taha, and Susan H. Eshleman
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K103N is frequently detected in HIV-infected women after single dose (SD) nevirapine (NVP). K103N-containing variants were detected more frequently by the ViroSeq HIV-1 Genotyping System in women with subtype C (69.2) than subtypes A (19.4, p< 0.0001) or D (36.1, p< 0.0001). K103N-containing variants were also detected more frequently and at higher levels in women with subtype C by the LigAmp assay. In this report, we analyzed samples collected prior to or within hours after SD NVP administration from antiretroviral drug-naive African women with subtypes A, C, and D. Only 1254 samples had an NVP resistance mutation detected with the ViroSeq system, and only 4236 samples had K103N detected at < 0.5 with the LigAmp assay [2110 (1.8) with subtype A, 146 (2.2) with subtype C, and 180 (1.3) with subtype D] (p 0.92). We did not detect significant differences in the pre-NVP frequency of NVP resistance mutations or the pre-NVP levels of K103N-containing variants in women with subtypes A, C, and D that explain the dramatic subtype-based differences in emergence of HIV-1 variants with these mutations after SD NVP exposure. [ABSTRACT FROM AUTHOR]
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- 2007
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107. Short Communication: Viral Dynamics and CD4+ T Cell Counts in Subtype C.
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Clive M. Gray, Carolyn Williamson, Helba Bredell, Adrian Puren, Xiaohua Xia, Ruben Filter, Lynn Zijenah, Huyen Cao, Lynn Morris, Efthyia Vardas, Mark Colvin, Glenda Gray, James McIntyre, Rosemary Musonda, Susan Allen, David Katzenstein, Mike Mbizo, Newton Kumwenda, Taha Taha, and Salim Abdool Karim
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- 2005
108. Factors related to attrition in a cohort study of HIV in Malawi
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OO Obasanjo and Newton Kumwenda
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Adult ,Gerontology ,Malawi ,Longitudinal study ,Patient Dropouts ,Birth weight ,Developing country ,HIV Infections ,Young Adult ,Bias ,Pregnancy ,Disease Transmission, Infectious ,Prevalence ,Humans ,Medicine ,Longitudinal Studies ,Pregnancy Complications, Infectious ,Socioeconomic status ,business.industry ,Infant, Newborn ,Retrospective cohort study ,General Medicine ,medicine.disease ,Socioeconomic Factors ,Cohort ,HIV-1 ,Female ,business ,Follow-Up Studies ,Demography ,Cohort study - Abstract
Background: Longitudinal studies face power reduction due to loss to follow up (LTFU). Bias may also arise because of differences between those who stay in the study and those who are LTFU We studied factors associated with LTFU in a cohort of HIV sero-negative and sera-positive mothers in urban Malawi. Objective: To bridge the existing gaps by examining the factors associated with attrition. Design: Longitudinal study. Setting: Queen Elizabeth Central Hospital (QECH) and the Kamuzu Central Hospital in Blantyre, Malawi. Subjects: One thousand three hundred and fifty three women who attended the prenatal clinic, between October 1989 and October 1990 were recruited as part of a study to determine rates and risk factors of sero-prevalence and sera-conversion of HIV -1 among this cohort. Results: In this cohort study, 1353 women were enrolled at delivery and 1188 (88%) returned for the first follow-up visit at three months post-partum. Of those who returned, 177 (15%) were subsequently lost during the remaining months of follow-up. The main predictors of L TFU were younger maternal age, lower educational level of the father, HIV infection of the mother, lower birth weight of the index child and mother not being married. Conclusions: Researchers planning studies in developing countries should consider the impact of lower education and poorer infant health on study retention in developing countries.
109. Breast milk retinol concentrations are not associated with systemic inflammation among breast-feeding women in Malawi
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Dancheck, B., Nussenblatt, V., Ricks, M. O., Newton Kumwenda, Neville, M. C., Moncrief, D. T., Taha, T. E., and Semba, R. D.
110. Mastitis and immunological factors in breast milk of lactating women in Malawi
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Semba, R. D., Newton Kumwenda, Taha, T. E., Hoover, D. R., Lan, Y., Eisinger, W., Mtimavalye, L., Broadhead, R., Miotti, P. G., Hoeven, L., and Chiphangwi, J. D.
111. HIV-1 prevalence and herpes simplex virus 2, hepatitis C virus, and hepatitis B virus infections among male workers at a sugar estate in Malawi
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Taha E. Taha, George N. Liomba, Ellen Taylor, Siobhan Sutcliffe, and Newton Kumwenda
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Adult ,Male ,Malawi ,Adolescent ,Carbohydrates ,medicine.disease_cause ,Orthohepadnavirus ,Acquired immunodeficiency syndrome (AIDS) ,Prevalence ,medicine ,Humans ,Pharmacology (medical) ,Aged ,Hepatitis B virus ,Hepatitis ,Acquired Immunodeficiency Syndrome ,Herpes Genitalis ,biology ,business.industry ,virus diseases ,Hepatitis C ,Middle Aged ,Hepatitis B ,biology.organism_classification ,medicine.disease ,Virology ,Infectious Diseases ,Hepadnaviridae ,Case-Control Studies ,HIV-1 ,Viral hepatitis ,business - Abstract
HIV-1 prevalence is approximately 23% among men working at a sugar estate in Malawi. Given the scale of the HIV epidemic in this country, it is important to determine possible cofactors of infection. The authors investigated associations between HIV-1 prevalence and herpes simplex virus 2 (HSV-2), hepatitis C virus (HCV), and hepatitis B virus (HBV) infections (indicated by anti-HSV-2, anti-HCV and HBsAg positivity, respectively) in a nested case-control study of 279 HIV-positive and 280 HIV-negative male workers. The prevalence of HSV-2 infection was 88.1% among HIV-positive persons and 64.3% among HIV-negative control subjects (p
112. Case Report: HIV test misdiagnosis.
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Mulinda, Nyirenda, Johnstone J., Kumwenda, and Newton, Kumwenda
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- 2011
113. Addition of Flucytosine to Fluconazole for the Treatment of Cryptococcal Meningitis in Africa: A Multicountry Cost-effectiveness Analysis
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Olivier Lortholary, Síle F. Molloy, Sokoine Kivuyo, Shabbar Jaffar, Lawrence Mwenge, Louis W. Niessen, Cecilia Kanyama, Angela Loyse, Elvis Temfack, Shabir Lakhi, Joseph N Jarvis, Tinevimbo Shiri, Peter Mwaba, Robert S. Heyderman, Mina C. Hosseinipour, Charles Kouanfack, Sayoki Mfinanga, Tao Chen, Duncan Chanda, Thomas S. Harrison, Adrienne K. Chan, Liverpool School of Tropical Medicine (LSTM), St George's, University of London, Zambart Health Economics Unit Lusaka, University Teaching Hospital (UTH), Lusaka, University Teaching Hospital [Lusaka] (UTH), Institute for Medical Research and Training, University of Teaching Lusaka, Department of Internal Medicine and Directorate of Research and Post-graduate Studies, Lusaka Apex Medical University, Zambia, University of Malawi, University College of London [London] (UCL), University of North Carolina Project-Malawi (UNC Project), University of North Carolina [Chapel Hill] (UNC), University of North Carolina System (UNC), Hôpital Central de Yaoundé [Yaoundé], Université de Dschang, Hôpital Général de Douala, Mycologie moléculaire - Molecular Mycology, Centre National de la Recherche Scientifique (CNRS)-Institut Pasteur [Paris], Centre National de Référence des Mycoses invasives et antifongiques - Mycologie moléculaire (CNRMA), Institut Pasteur [Paris]-Centre National de la Recherche Scientifique (CNRS), National Institute for Medical Research - Muhimbili Research Centre (NIMR), Zomba Central Hospital Malawi, University of Toronto, London School of Hygiene and Tropical Medicine (LSHTM), Bostwana Harvard AIDS Institute Partneship Gaborone, Centre d'infectiologie Necker-Pasteur [CHU Necker], CHU Necker - Enfants Malades [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut Pasteur [Paris], Johns Hopkins Bloomberg School of Public Health [Baltimore], Johns Hopkins University (JHU), This work was supported by grants to the Advancing Cryptococcal Meningitis Treatment for Africa trial from the Medical Research Council, United Kingdom (grant number 100504) and the French Agency for Research on AIDS and Viral Hepatitis (ANRS, grant number ANRS12275)., The authors thank all the patients and their families, Andrew Nunn, Halima Dawood, Andrew Kitua, and William Powderly for serving on the data and safety monitoring committee, and Graeme Meintjes, Calice Talom, Newton Kumwenda, and Maryline Bonnet for serving on the trial steering committee., Institut Pasteur [Paris] (IP)-Centre National de la Recherche Scientifique (CNRS), Institut Pasteur [Paris] (IP)-CHU Necker - Enfants Malades [AP-HP], and Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)
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Microbiology (medical) ,medicine.medical_specialty ,Antifungal Agents ,Cost effectiveness ,Cost-Benefit Analysis ,flucytosine ,Meningitis, Cryptococcal ,Flucytosine ,03 medical and health sciences ,0302 clinical medicine ,Pharmacotherapy ,cryptococcal meningitis ,Internal medicine ,Amphotericin B ,fluconazole ,medicine ,Humans ,030212 general & internal medicine ,Articles and Commentaries ,cost-effectiveness ,[SDV.MP.MYC]Life Sciences [q-bio]/Microbiology and Parasitology/Mycology ,health care economics and organizations ,0303 health sciences ,treatment ,030306 microbiology ,business.industry ,Mortality rate ,virus diseases ,Cost-effectiveness analysis ,Confidence interval ,3. Good health ,respiratory tract diseases ,Infectious Diseases ,Africa ,business ,Fluconazole ,medicine.drug - Abstract
Background Mortality from cryptococcal meningitis remains very high in Africa. In the Advancing Cryptococcal Meningitis Treatment for Africa (ACTA) trial, 2 weeks of fluconazole (FLU) plus flucytosine (5FC) was as effective and less costly than 2 weeks of amphotericin-based regimens. However, many African settings treat with FLU monotherapy, and the cost-effectiveness of adding 5FC to FLU is uncertain. Methods The effectiveness and costs of FLU+5FC were taken from ACTA, which included a costing analysis at the Zambian site. The effectiveness of FLU was derived from cohorts of consecutively enrolled patients, managed in respects other than drug therapy, as were participants in ACTA. FLU costs were derived from costs of FLU+5FC in ACTA, by subtracting 5FC drug and monitoring costs. The cost-effectiveness of FLU+5FC vs FLU alone was measured as the incremental cost-effectiveness ratio (ICER). A probabilistic sensitivity analysis assessed uncertainties and a bivariate deterministic sensitivity analysis examined the impact of varying mortality and 5FC drug costs on the ICER. Results The mean costs per patient were US $847 (95% confidence interval [CI] $776–927) for FLU+5FC, and US $628 (95% CI $557–709) for FLU. The 10-week mortality rate was 35.1% (95% CI 28.9–41.7%) with FLU+5FC and 53.8% (95% CI 43.1–64.1%) with FLU. At the current 5FC price of US $1.30 per 500 mg tablet, the ICER of 5FC+FLU versus FLU alone was US $65 (95% CI $28–208) per life-year saved. Reducing the 5FC cost to between US $0.80 and US $0.40 per 500 mg resulted in an ICER between US $44 and US $28 per life-year saved. Conclusions The addition of 5FC to FLU is cost-effective for cryptococcal meningitis treatment in Africa and, if made available widely, could substantially reduce mortality rates among human immunodeficiency virus–infected persons in Africa., The combination of flucytosine plus fluconazole (FLU) is cost-effective, compared with the commonly used regimen of FLU monotherapy, for cryptococcal meningitis treatment in Africa, with an incremental cost-effectiveness ratio of US $65 per life-year saved at the current price.
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- 2020
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