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1. Aetiology of Anaemia among Pregnant Women in Northern Ghana

Author

Ahenkorah, Benjamin, primary, Helegbe, Gideon, additional, Der, Edmund Muonir, additional, Emba, Nana Obema Asantewaa, additional, Donkor, Addai-Mensah, additional, Ofosu, Winfred, additional, Johnson, Priscilla Arthur, additional, Okai, Bernard Kwaku, additional, Simono, Ana Maria, additional, Opare-Asamoah, Kwame, additional, Udzu, Regina Frimpong, additional, Emmanuel, Akatibo, additional, Faakuu, Eric, additional, Ogoe, Edwin Anum, additional, Dorkenoo, Jones, additional, Bimpong, Samuel, additional, Kyere, Emmanuel Danquah, additional, Adam, Ussiph, additional, and Gyan, Ben, additional

Published
2023
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2. Evaluating circulating soluble markers of endothelial dysfunction and risk factors associated with PE: A multicentre longitudinal case control study in northern Ghana

Author

Ahenkorah, Benjamin, Sakyi, Samuel Asamoah, Fondjo, Linda Ahenkorah, Helegbe, Gideon, Owiredu, Eddie-Williams, Der, Edmund Muonir, Amoah, Linda Eva, Kusi, Kwadwo Asamoah, Obiri, Dorotheah, Amoani, Benjamin, Bimpong, Samuel, Ofosu, Winfred, Obirikorang, Christian, Odame, Enoch, Larbie, Christopher, Arthur-Johnson, Priscilla, Quaye, Isaac, Ametefe, Emmanuel Mawuli, Okai, Bernard Kwaku, Anormah, Rasheed, Akorli, Emmanuel, Simono Charadan, Ana Maria, Aboubacar, Robilu Mikdad, Amesewu, Emmanuel, and Gyan, Ben

Published
2023
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3. Preponderance of vaccine-preventable diseases hotspots in northern Ghana: a spatial and space-time clustering analysis from 2010 to 2014

Author

Amoako-Sakyi, Daniel, Obiri-Yeboah, Dorcas, Ofosu, Anthony, Kusi, Kwadwo Asamoah, Osei, Kingsley, Adade, Richard, Aniakwaa-Bonsu, Ebenezer, Quansah, Reginald, Arko-Mensah, John, Amoah, Brodrick Yeboah, Kwakye-Nuako, Godwin, Frimpong, Eric Yaw, Combasseré-Cherif, Mariama, Mohammed, Hidaya, Maiga, Boubacar, Fobil, Julius, Quakyi, Isabella, and Gyan, Ben A.

Published
2022
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5. The Pan African Vivax and Ovale Network (PAVON): Refocusing on Plasmodium vivax, ovale and asymptomatic malaria in sub-Saharan Africa

Author

Quaye, Isaac K., Aleksenko, Larysa, Oeuvray, Claude, Yewhalaw, Delenasaw, Duah, Nancy, Gyan, Ben, Haiyambo, Daniel H., Dongho, Ghyslaine Bruna Djeunang, Torgby, Ruth-Ayanful, Amoah, Linda, Hamid, Mahdi Abdel, Worku, Solomon, Bahiti, Assefa Ashenafi, Pasquale, Harriet Akello, Bitshi, Mimie, Troare, Isidore, Diarra, Amidou, Njunju, Eric, Cisse, Mamoudou, Soulama, Issiaka, Savadogo, Ragnessi Justin, Issifou, Saadou, Niangaly, Amadou, Dembele, Laurent, and Greco, Beatrice

Published
2021
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7. Serological evidence of vector and parasite exposure in Southern Ghana: the dynamics of malaria transmission intensity

Author

Badu, Kingsley, Gyan, Ben, Appawu, Maxwell, Mensah, Daniel, Dodoo, Daniel, Yan, Guiyun, Drakeley, Chris, Zhou, Guofa, Owusu-Dabo, Ellis, and Koram, Kwadwo Ansah

Subjects
Medical Microbiology, Biomedical and Clinical Sciences, Clinical Sciences, Rare Diseases, Malaria, Biotechnology, Infectious Diseases, Vector-Borne Diseases, 2.2 Factors relating to the physical environment, Aetiology, Infection, Good Health and Well Being, Adolescent, Adult, Animals, Anopheles, Child, Child, Preschool, Ghana, Humans, Immunoglobulin G, Insect Bites and Stings, Malaria, Falciparum, Merozoite Surface Protein 1, Salivary Proteins and Peptides, Seroepidemiologic Studies, Young Adult, Public Health and Health Services, Mycology & Parasitology, Tropical Medicine, Microbiology, Medical microbiology
Abstract

BackgroundSeroepidemiology provides robust estimates for tracking malaria transmission when intensity is low and useful when there is no baseline entomological data. Serological evidence of exposure to malaria vectors and parasite contribute to our understanding of the risk of pathogen transmission, and facilitates implementation of targeted interventions. Ab to Anopheles gambiae salivary peptide (gSG6-P1) and merozoite surface protein one (MSP-1(19)) reflect human exposure to malaria vectors and parasites. This study estimated malaria transmission dynamics using serological evidence of vector and parasite exposure in southern Ghana.MethodsTotal IgG responses to both antigens in an age stratified cohort (14) were measured from South-eastern Ghana. 295 randomly selected sera were analyzed from archived samples belonging to a cohort study that were followed at 3 consecutive survey months (n = 885); February, May and August 2009. Temporal variations in seroprevalence of both antigens as well as differences between the age-stratified cohorts were determined by χ (2) test with p < 0.05 statistically significant. Non-parametric repeated ANOVA - Friedman's test was used to test differences in antibody levels. Seroprevalence data were fitted to reversible catalytic model to estimate sero-conversion rates.ResultsWhereas parasite prevalence was generally low 2.4%, 2.7% and 2.4% with no apparent trends with season, seroprevalence to both gSG6-P1 and MSP1(19) were high (59%, 50.9%, 52.2%) and 57.6%, 52.3% and 43.6% in respective order from Feb. to August. Repeated measures ANOVA showed differences in median antibody levels across surveys with specific significant differences between February and May but not August by post hoc Dunn's multiple comparison tests for gSG6-P1. For MSP1(19), no differences were observed in antibody levels between February and May but a significant decline was observed from May to August. Seroconversion rates for gSG6-P1 increased by 1.5 folds from February to August and 3 folds for MSP1(19).ConclusionData suggests exposure to infectious bites may be declining whereas mosquito bites remains high. Sustained malaria control efforts and surveillance are needed to drive malaria further down and to prevent catastrophic rebound. Operational factors for scaling up have been discussed.

Published
2015

12. Do Blood group and Sickle cell trait protect against placental malaria?

Author

LUUSE, ARNOLD T., ALIDU, HUSEINI, MAWULI, MAWUSI ADEPA, MUBARAK, ABDUL‑RAHMAN, and GYAN, BEN

Abstract

Blood group O is reported to confer some degree of protection from severe malaria in endemic setting. This protection is believed to be due to reduced and smaller rosette formation in people of blood group O which can easily be cleared by the host immune system. Also, sickle cell trait (HbAS) is reported to disrupt the adhesion of infected erythrocytes to microvascular endothelial walls, which could protect pregnant women from placental malaria. We determined the association between HbAS and ABO blood group, and placental malaria amongst pregnant women of all parities. The study enrolled 221 pregnant women. Peripheral blood samples were taken for malaria smears, ABO blood grouping and haemoglobin (Hb) electrophoresis. A struc‑ tured questionnaire was used to age, bed net usage, and the number of Sulphadoxine‑pyrimethamine (SP) doses taken by a pregnant woman. Two hundred and twenty‑one (221) pregnant women were enrolled and out of this number, 110 (49.8%) were primiparae and 111 (50.2%) multiparae, with a mean age of 23.7±5.2. Placental malaria (PM) prevalence by PCR detection was 19.4% (43/221). Of those who were malaria positive 58.1% (25/43) were primiparae. Primiparae who are of blood group O were more susceptible to PM [P=0.04, (OR); 2.85, 95% (Cl), 1.12‑9.01]. But sickle cell trait did not reduce the prevalence of PM [P=0.84 (OR); 0.92, 95% (Cl), 0.43‑1.99]. Non‑blood group O primiparae women were protected against placental malaria. This could be why some primiparae women are protected from PM, just like multiparae women. [ABSTRACT FROM AUTHOR]

Published
2023
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13. RTS,S/AS01E immunization increases antibody responses to vaccine-unrelated Plasmodium falciparum antigens associated with protection against clinical malaria in African children: a case-control study

Author

Dobaño, Carlota, Ubillos, Itziar, Jairoce, Chenjerai, Gyan, Ben, Vidal, Marta, Jiménez, Alfons, Santano, Rebeca, Dosoo, David, Nhabomba, Augusto J., Ayestaran, Aintzane, Aguilar, Ruth, Williams, Nana Aba, Díez-Padrisa, Núria, Lanar, David, Chauhan, Virander, Chitnis, Chetan, Dutta, Sheetij, Gaur, Deepak, Angov, Evelina, Asante, Kwaku Poku, Owusu-Agyei, Seth, Valim, Clarissa, Gamain, Benoit, Coppel, Ross L., Cavanagh, David, Beeson, James G., Campo, Joseph J., and Moncunill, Gemma

Published
2019
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14. Antigenicity and immune correlate assessment of seven Plasmodium falciparum antigens in a longitudinal infant cohort from northern Ghana

Author

Kusi, Kwadwo Asamoah, Aguiar, Joao, Kumordjie, Selassie, Aggor, Felix, Bolton, Jessica, Renner, Andrea, Kyei-Baafour, Eric, Puplampu, Naiki, Belmonte, Maria, Dodoo, Daniel, Gyan, Ben Adu, Ofori, Michael Fokuo, Oduro, Abraham Rex, Atuguba, Frank, Koram, Kwadwo Ansah, Adams, Nehkonti, Letizia, Andrew, Villasante, Eileen, and Sedegah, Martha

Published
2019
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15. Concentration and avidity of antibodies to different circumsporozoite epitopes correlate with RTS,S/AS01E malaria vaccine efficacy

Author

Dobaño, Carlota, Sanz, Hèctor, Sorgho, Hermann, Dosoo, David, Mpina, Maximilian, Ubillos, Itziar, Aguilar, Ruth, Ford, Tom, Díez-Padrisa, Núria, Williams, Nana Aba, Ayestaran, Aintzane, Traore, Ousmane, Nhabomba, Augusto J., Jairoce, Chenjerai, Waitumbi, John, Agnandji, Selidji Todagbe, Kariuki, Simon, Abdulla, Salim, Aponte, John J., Mordmüller, Benjamin, Asante, Kwaku Poku, Owusu-Agyei, Seth, Tinto, Halidou, Campo, Joseph J., Moncunill, Gemma, Gyan, Ben, Valim, Clarissa, and Daubenberger, Claudia

Published
2019
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18. Baseline exposure, antibody subclass, and hepatitis B response differentially affect malaria protective immunity following RTS,S/AS01E vaccination in African children

Author

Ubillos, Itziar, Ayestaran, Aintzane, Nhabomba, Augusto J, Dosoo, David, Vidal, Marta, Jiménez, Alfons, Jairoce, Chenjerai, Sanz, Hèctor, Aguilar, Ruth, Williams, Nana Aba, Díez-Padrisa, Núria, Mpina, Maximilian, Sorgho, Hermann, Agnandji, Selidji Todagbe, Kariuki, Simon, Mordmüller, Benjamin, Daubenberger, Claudia, Asante, Kwaku Poku, Owusu-Agyei, Seth, Sacarlal, Jahit, Aide, Pedro, Aponte, John J, Dutta, Sheetij, Gyan, Ben, Campo, Joseph J, Valim, Clarissa, Moncunill, Gemma, and Dobaño, Carlota

Published
2018
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22. Plasmodium falciparum coinfection is associated with improved IgE and IgG3 response against hookworm antigens

Author

Sakyi, Samuel A., primary, Wilson, Michael D., additional, Adu, Bright, additional, Opoku, Stephen, additional, Brewoo, Antwi, additional, Larbi, Amma, additional, Baafour, Emmanuel K., additional, Tchum, Samuel K., additional, Saahene, Roland O., additional, Aniagyei, Wilfred, additional, Sewor, Christian, additional, Courtin, David, additional, Cappello, Michael, additional, Gyan, Ben, additional, and Amoani, Benjamin, additional

Published
2022
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23. Strong off-target antibody reactivity to malarial antigens induced by RTS,S/AS01E vaccination is associated with protection

Author

Macià, Dídac, primary, Campo, Joseph J., additional, Moncunill, Gemma, additional, Jairoce, Chenjerai, additional, Nhabomba, Augusto J., additional, Mpina, Maximilian, additional, Sorgho, Hermann, additional, Dosoo, David, additional, Traore, Ousmane, additional, Kusi, Kwadwo Asamoah, additional, Williams, Nana Aba, additional, Oberai, Amit, additional, Randall, Arlo, additional, Sanz, Hèctor, additional, Valim, Clarissa, additional, Asante, Kwaku Poku, additional, Owusu-Agyei, Seth, additional, Tinto, Halidou, additional, Agnandji, Selidji Todagbe, additional, Kariuki, Simon, additional, Gyan, Ben, additional, Daubenberger, Claudia, additional, Mordmüller, Benjamin, additional, Petrone, Paula, additional, and Dobaño, Carlota, additional

Published
2022
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24. Foeto-maternal complications associated with low birth weight: A prospective multicenter study in northern Ghana

Author

Ahenkorah, Benjamin, primary, Sakyi, Samuel Asamoah, additional, Helegbe, Gideon, additional, Owiredu, Eddie-Williams, additional, Fondjo, Linda Ahenkorah, additional, Ofosu, Winfred, additional, Der, Edmund Muonir, additional, Amoani, Benjamin, additional, Larbi, Amma Aboagyewa, additional, Cheetham, Susanna, additional, Arthur-Johnson, Priscilla, additional, Kwablah, Grant Jenny, additional, and Gyan, Ben, additional

Published
2022
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25. Increased ShTAL1 IgE responses post-Praziquantel treatment may be associated with a reduced risk to re-infection in a Ghanaian S. haematobium-endemic community

Author

Asuming-Brempong, Elias K., primary, Ayi, Irene, additional, van der Puije, William, additional, Gyan, Ben A., additional, Larbi, Irene A., additional, Ashong, Yvonne, additional, Frempong, Naa Adjeley, additional, Quartey, Joseph K., additional, Otchere, Joseph, additional, Jones, Frances M., additional, Wilson, Shona, additional, Dunne, David W., additional, and Boakye, Daniel A., additional

Published
2022
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27. Additional file 1 of Detecting asymptomatic carriage of Plasmodium falciparum in southern Ghana: utility of molecular and serological diagnostic tools

Author

Agbana, Hamza B., Rogier, Eric, Lo, Aminata, Abukari, Zakaria, Jones, Sophie, Gyan, Ben, Aidoo, Michael, and Amoah, Linda E.

Subjects
parasitic diseases
Abstract

Additional file 1: Table S1. Primer properties. Table S2. Summary of parasite prevalence data. Table S3. Comparison between the three sensitive methods in the two study sites. Figure S1. Illustrative Flow chart showing the total number of positive and negative samples detected by the combination of 5 different of P. falciparum diagnosis tools in the high and low malaria transmission setting. Figure S2. Illustrative Flow chart showing asymptomatic malaria diagnosis by the three sensitive diagnostic tools in the high transmission setting. Figure S3. Illustrative Flow chart showing asymptomatic malaria diagnosis by the three sensitive diagnostic tools in the low transmission setting.

Published
2022
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30. Strong off-target antibody reactivity to malarial antigens induced by RTS,S/AS01E vaccination is associated with increased protection

Author

Macià, Dídac, primary, Campo, Joseph J., additional, Moncunill, Gemma, additional, Jairoce, Chenjerai, additional, Nhabomba, Augusto J., additional, Mpina, Maximilian, additional, Sorgho, Hermann, additional, Dosoo, David, additional, Traore, Ousmane, additional, Kusi, Kwadwo Asamoah, additional, Williams, Nana Aba, additional, Randall, Arlo, additional, Sanz, Hèctor, additional, Valim, Clarissa, additional, Asante, Kwaku Poku, additional, Owusu-Agyei, Seth, additional, Tinto, Halidou, additional, Agnandji, Selidji Todagbe, additional, Kariuki, Simon, additional, Gyan, Ben, additional, Daubenberger, Claudia, additional, Mordmüller, Benjamin, additional, Petrone, Paula, additional, and Dobaño, Carlota, additional

Published
2021
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37. Association of TNF-Alpha, MBL2, NOS2, and G6PD with Malaria Outcomes in People in Southern Ghana.

Author

Futagbi, Godfred, Otu, Paulina S, Abdul-Rahman, Mubarak, Aidoo, Ebenezer K, Lo, Aminata C, Gyan, Ben A, Afrane, Yaw A, and Amoah, Linda E

Subjects
MALARIA, RESTRICTION fragment length polymorphisms, TUMOR necrosis factors
Abstract

Background. One major issue that has set back the gains of the numerous malaria control interventions that national malaria control programs have implemented is asymptomatic malaria. Certain host genetic factors are known to influence symptomatic malaria; however, not much is known about how host genetics influences the acquisition of asymptomatic malaria. Methods. Genomic DNA was extracted from whole blood collected from 60 symptomatic and 149 nonfebrile (asymptomatic, N = 109, and uninfected, N = 40) volunteers aged between 2 and 69 years from a high (Obom) and a low (Asutsuare) malaria transmission setting in Southern Ghana. Restriction fragment length polymorphism (RFLP) was used to determine polymorphisms at the MBL2 54, TNF-α 308, NOS2 954, and G6PD 202/376 gene loci. Results. Polymorphisms at the MBL2 54 and TNF-α 308 loci were significantly different amongst the three categories of volunteers in both Asutsuare (p = 0.006) and Obom p = 0.05 . In Asutsuare, a low malaria transmission area, the allele G has significantly higher odds (3.15) of supporting asymptomatic malaria as against symptomatic malaria. There were significantly higher odds of TNF-α genotype GA being associated with symptomatic malaria as against asymptomatic malaria in both sites, Obom p = 0.027 and Asutsuare p = 0.027 . The allele B of the G6PD gene was more prevalent in symptomatic rather than asymptomatic parasite-infected individuals in both Obom p = 0.001 and Asutsuare p = 0.003 . Conclusion. Individuals in Southern Ghana carrying the TNF-α 308 GA genotype are more likely to exhibit symptoms of malaria when infected with the malaria parasite as opposed to harboring an asymptomatic infection. Also, the B allele of the G6PD gene is likely to prevent a P. falciparum-infected person from exhibiting symptoms and thereby promote asymptomatic parasite carriage. [ABSTRACT FROM AUTHOR]

Published
2022
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42. Stage-specific Plasmodium falciparum immune responses in afebrile adults and children living in the Greater Accra Region of Ghana

Author

Acquah, Festus K, Lo, Aminata C, Akyea-Mensah, Kwadwo, Abagna, Hamza B, Faye, Babacar, Theisen, Michael, Gyan, Ben A, Amoah, Linda E, Acquah, Festus K, Lo, Aminata C, Akyea-Mensah, Kwadwo, Abagna, Hamza B, Faye, Babacar, Theisen, Michael, Gyan, Ben A, and Amoah, Linda E

Abstract

BACKGROUND: Asymptomatic carriage of Plasmodium falciparum is widespread in adults and children living in malaria-endemic countries. This study identified the prevalence of malaria parasites and the corresponding levels of naturally acquired anti-parasite antibody levels in afebrile adults living in two communities in the Greater Accra Region of Ghana.METHODS: Two cross-sectional studies conducted in January and February 2016 and repeated in July and August 2016 recruited subjects aged between 6 and 75 years from high parasite prevalence (Obom) and low parasite prevalence (Asutsuare) communities. Whole blood (5 ml) was collected from each volunteer, plasma was aliquoted and frozen until needed. An aliquot (10 µl) of the blood was used to prepare thick and thin blood smears, 100 µl was preserved in Trizol and the rest was separated into plasma and blood cells and each stored at - 20 °C until needed. Anti-MSP3 and Pfs230 antibody levels were measured using ELISA.RESULTS: Asexual parasite and gametocyte prevalence were higher in Obom than Asutsuare. Antibody (IgG, IgG1, IgG3, IgM) responses against the asexual parasite antigen MSP3 and gametocyte antigen Pfs230 were higher in Obom during the course of the study except for IgM responses against Pfs230, which was higher in Asutsuare than in Obom during the rainy season. Antibody responses in Asutsuare were more significantly associated with age than the responses measured in Obom.CONCLUSION: The pattern of antibody responses measured in people living in the high and low malaria transmission setting was similar. All antibody responses measured against the asexual antigen MSP3 increased, however, IgG and IgG1 responses against gametocyte antigen Pfs230 decreased in moving from the dry to the peak season in both sites. Whilst asexual and gametocyte prevalence was similar between the seasons in the low transmission setting, in the high transmission setting asexual parasite prevalence increased but gam

Published
2020

43. Perspectives on Research Internships for Medical Students and Young Doctors in Ghana: An Opportunity to Replenish the Stock of Physician Investigators?

Author

Tette,Edem MA, Gyan,Ben A, Koram,Kwadwo A, Tette,Edem MA, Gyan,Ben A, and Koram,Kwadwo A

Abstract

Edem MA Tette,1 Ben A Gyan,2 Kwadwo A Koram3 1Department of Community Health, University of Ghana Medical School, Accra, Greater Accra Region, Ghana; 2Department of Immunology, Noguchi Memorial Institute for Medical Research University of Ghana, Accra, Greater Accra Region, Ghana; 3Department of Epidemiology, Noguchi Memorial Institute for Medical Research University of Ghana, Accra, Greater Accra Region, GhanaCorrespondence: Edem MA Tette Email edemenator@googlemail.comAbstract: The corona virus pandemic undoubtedly demonstrates the growing need for research in medical science. However, with the decline in physician scientists world-wide, innovative ways are needed to engender interest in research among medical students and young doctors to replenish the stock of physician investigators. One way of doing this is to create compulsory and elective projects for them. We describe research internships created for medical students at the Noguchi Memorial Institute for Medical Research to expose them to the rudiments of biomedical research and proposal development. We also describe research internships for doctors waiting for house job postings or keen to do research who needed mentorship. Though the response has been positive, the full impact will be realized with time. The recognition that training should be backed with a supportive environment, mentorship and clear career paths for physician scientists is also mentioned.Keywords: research, internship, medical students, doctors, physician scientist, investigator, extracurricular research, medical education

Published
2020

44. Preponderance of Vaccine Preventable Diseases Hotspots in Northern Ghana: A Spatial and Space-Time Clustering Analysis from 2010 to 2014

Author

Amoako-Sakyi, Daniel, primary, Obiri-Yeboah, Dorcas, additional, Ofosu, Anthony, additional, Kusi, Kwadwo Asamoah, additional, osei, Kingsley, additional, Adade, Richard, additional, Aniakwaa-Bonsu, Ebenezer, additional, Quansah, Reginald, additional, Arko-Mensah, John, additional, Amoah, Brodrick Yeboah, additional, Kwakye-Nuako, Godwin, additional, Combasseré-Cherif, Mariama Kaba, additional, Mohammed, Hidaya, additional, Maiga, Boubacar, additional, Fobil, Julius, additional, Quakyi, Isabella, additional, and Gyan, Ben A., additional

Published
2021
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45. RTS,S/AS01E malaria vaccine induces IgA responses against CSP and vaccine-unrelated antigens in African children in the phase 3 trial

Author

Suau, Roger, primary, Vidal, Marta, additional, Aguilar, Ruth, additional, Ruiz-Olalla, Gemma, additional, Vázquez-Santiago, Miquel, additional, Jairoce, Chenjerai, additional, Nhabomba, Augusto J., additional, Gyan, Ben, additional, Dosoo, David, additional, Asante, Kwaku Poku, additional, Owusu-Agyei, Seth, additional, Campo, Joseph J., additional, Izquierdo, Luis, additional, Cavanagh, David, additional, Coppel, Ross L., additional, Chauhan, Virander, additional, Angov, Evelina, additional, Dutta, Sheetij, additional, Gaur, Deepak, additional, Beeson, James G., additional, Moncunill, Gemma, additional, and Dobaño, Carlota, additional

Published
2021
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46. Prevalence and Risk Factors Associated With Preeclampsia, Low Birth Weight and Postpartum Hemorrhage in Northern Ghana

Author

Ahenkorah, Benjamin, primary, Sakyi, Samuel, additional, Helegbe, Gideon, additional, Owiredu, Eddie, additional, Ofosu, Winfred, additional, Der, Edmund, additional, Ephraim, Richard, additional, Amoani, Benjamin, additional, Arthur, Priscilla, additional, Apio, Dominic, additional, Cheetham, Susanna, additional, and Gyan, Ben, additional

Published
2020
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