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Tebben K, Yirampo S, Coulibaly D, Koné A, Laurens M, Stucke E, Dembélé A, Tolo Y, Traoré K, Niangaly A, Berry A, Kouriba B, Plowe C, Doumbo O, Lyke K, Takala-Harrison S, Thera M, Travassos M, Serre D. Gene expression analyses reveal differences in children's response to malaria according to their age. Res Sq 2023:rs.3.rs-3487114. [PMID: 37961587 PMCID: PMC10635353 DOI: 10.21203/rs.3.rs-3487114/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
In Bandiagara, Mali, children experience on average two clinical malaria episodes per season. However, even in the same transmission area, the number of uncomplicated symptomatic infections, and their parasitemia, vary dramatically among children. To examine the factors contributing to these variations, we simultaneously characterized the host and parasite gene expression profiles from 136 children with symptomatic falciparum malaria and analyzed the expression of 9,205 human and 2,484 Plasmodium genes. We used gene expression deconvolution to estimate the relative proportion of immune cells and parasite stages in each sample and to adjust the differential gene expression analyses. Parasitemia explained much of the variation in both host and parasite gene expression and revealed that infections with higher parasitemia had more neutrophils and fewer T cells, suggesting parasitemia-dependent neutrophil recruitment and/or T cell extravasation to secondary lymphoid organs. The child's age was also strongly correlated with gene expression variations. Plasmodium falciparum genes associated with age suggested that older children carried more male gametocytes, while host genes associated with age indicated a stronger innate response (through TLR and NLR signaling) in younger children and stronger adaptive immunity (through TCR and BCR signaling) in older children. These analyses highlight the variability in host responses and parasite regulation during P. falciparum symptomatic infections and emphasize the importance of considering the children's age when studying and treating malaria infections.
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Affiliation(s)
| | - Salif Yirampo
- Universite des Sciences des Techniques et des Technologies de Bamako
| | - Drissa Coulibaly
- Universite des Sciences des Techniques et des Technologies de Bamako
| | - Abdoulaye Koné
- Universite des Sciences des Techniques et des Technologies de Bamako
| | | | | | - Ahmadou Dembélé
- Universite des Sciences des Techniques et des Technologies de Bamako
| | - Youssouf Tolo
- Universite des Sciences des Techniques et des Technologies de Bamako
| | - Karim Traoré
- Universite des Sciences des Techniques et des Technologies de Bamako
| | - Ahmadou Niangaly
- Universite des Sciences des Techniques et des Technologies de Bamako
| | | | - Bourema Kouriba
- Universite des Sciences des Techniques et des Technologies de Bamako
| | | | - Ogobara Doumbo
- Universite des Sciences des Techniques et des Technologies de Bamako
| | | | | | - Mahamadou Thera
- Malaria Research and Training Centre-International Center for Excellence in Research (MRTC-ICER)
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Niangaly H, Audibert M, Sagara I, Djimdé A, Doumbo O. Réduction du choc de santé, épargne des ménages et investissements dans l’éducation – Cas du paludisme au Mali. Rev Epidemiol Sante Publique 2021. [DOI: 10.1016/j.respe.2021.04.107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Sogodogo E, Doumbo O, Kouriba B, Aboudharam G. Microbial biodiversity of natural toothbrushes in Mali. New Microbes New Infect 2021; 40:100844. [PMID: 33796319 PMCID: PMC7995651 DOI: 10.1016/j.nmni.2021.100844] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 01/13/2021] [Accepted: 01/20/2021] [Indexed: 11/26/2022] Open
Abstract
Different oral hygiene practices are used to overcome endemic diseases such as dental caries and oral infections. In Mali (Africa), natural plant-based toothbrushes are used for eliminating bacterial biofilm. The repertoire of microorganisms associated with natural toothbrushes is unknown. The aim of our study is to study microbial flora in particular the methanogenic archaea associated with natural toothbrushes recently recognized as responsible for periodontitis and peri-implantitis. We investigated the methanogens and bacteria associated with 15 different natural plant toothbrushes collected in Bamako local market (Mali). Microbiological investigations consisted in culturing the bacteria on agar plates and searching archaea using molecular techniques. No archaea were demonstrated by molecular biology but 50 bacterial species, including 33 aero-anaerobic and 17 aerobic species, were isolated from natural toothbrushes. We isolated Pseudomonas sp., Staphylococcus sp. and Klebsiella pneumoniae, which are acknowledged as opportunistic human pathogens. This study has highlighted the likely impact of the use of natural toothbrushes in the spread of potentially pathogenic bacteria in the human oral cavity.
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Affiliation(s)
- E Sogodogo
- Aix Marseille Université. IRD, MEPHI, IHU-Méditerranée Infection, Marseille, France.,IHU Méditerranée Infection, Marseille, France
| | - O Doumbo
- Department of Epidemiology of Parasitic Diseases, Malaria Research and Training Centre, University of Science, Techniques and Technologies of Bamako, Bamako, Mali
| | - B Kouriba
- Department of Epidemiology of Parasitic Diseases, Malaria Research and Training Centre, University of Science, Techniques and Technologies of Bamako, Bamako, Mali.,Centre d'infectiologie Charles-Mérieux (CICM), Bamako, Mali
| | - G Aboudharam
- Aix Marseille Université. IRD, MEPHI, IHU-Méditerranée Infection, Marseille, France.,Aix-Marseille Université, UFR Odontology, Marseille, France
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Sogodogo E, Doumbo O, Aboudharam G, Kouriba B, Diawara O, Koita H, Togora S, Drancourt M. First characterization of methanogens in oral cavity in Malian patients with oral cavity pathologies. BMC Oral Health 2019; 19:232. [PMID: 31666044 PMCID: PMC6820998 DOI: 10.1186/s12903-019-0929-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 10/16/2019] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND The oral cavity of humans is inhabited by several hundreds of bacterial species and other microorganisms such as fungi and archaeal methanogens. Regarding methanogens, data have been obtained from oral cavity samples collected in Europe, America and Asia. There is no study published on the presence of methanogens in the oral cavity in persons living in Africa. The objective of our study was to bring new knowledge on the distribution of oral methanogens in persons living in Mali, Africa. METHODS A total of 31 patients were included in the study during a 15-day collection period in September. Bacterial investigations consisted in culturing the bacteria in 5% sheep blood-enriched Columbia agar and PolyViteX agar plates. For archaeal research, we used various methods including culture, molecular biology and fluorescent in situ hybridization (FISH). RESULTS Eight of 31 (26%) oral samples collected in eight patients consulting for stomatology diseases tested positive in polymerase chain-reaction (PCR)-based assays for methanogens including five cases of Methanobrevibacter oralis and one case each of Methanobrevibacter smithii, Methanobrevibacter massiliense and co-infection Methanobrevibacter oralis and Methanobrevibacter massiliense. CONCLUSIONS In this pilot study, we are reporting here the first characterization of methanogens in the oral cavity in eight patients in Mali. These methanogen species have already been documented in oral specimens collected from individuals in Europe, Asia, North America and Brazil.
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Affiliation(s)
- Elisabeth Sogodogo
- Aix Marseille University, IRD, MEPHI, IHU-Méditerranée Infection, 19-21, Boulevard Jean Moulin, 13005, Marseille, France.,IHU Méditerranée Infection, Marseille, France
| | - Ogobara Doumbo
- Department of Epidemiology of Parasitic Diseases, Malaria Research and Training Center, University of Science, Techniques and Technologies of Bamako, Bamako, Mali
| | - Gérard Aboudharam
- Aix Marseille University, IRD, MEPHI, IHU-Méditerranée Infection, 19-21, Boulevard Jean Moulin, 13005, Marseille, France.,Aix-Marseille-University, UFR Odontology, Marseille, France
| | - Bourema Kouriba
- Department of Epidemiology of Parasitic Diseases, Malaria Research and Training Center, University of Science, Techniques and Technologies of Bamako, Bamako, Mali.,Centre d'Infectiologie Charles-Mérieux (CICM), Bamako, Mali
| | - Ousseynou Diawara
- National Center of Odonto Stomatology, Faculty of Medicine and Odonto Stomatology, Bamako, Mali
| | - Hapssa Koita
- National Center of Odonto Stomatology, Faculty of Medicine and Odonto Stomatology, Bamako, Mali
| | - Souleymane Togora
- National Center of Odonto Stomatology, Faculty of Medicine and Odonto Stomatology, Bamako, Mali
| | - Michel Drancourt
- Aix Marseille University, IRD, MEPHI, IHU-Méditerranée Infection, 19-21, Boulevard Jean Moulin, 13005, Marseille, France.
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Chandramohan D, Dicko A, Zongo I, Sagara I, Cairns M, Kuepfer I, Diarra M, Barry A, Tapily A, Nikiema F, Yerbanga S, Coumare S, Thera I, Traore A, Milligan P, Tinto H, Doumbo O, Ouedraogo JB, Greenwood B. Effect of Adding Azithromycin to Seasonal Malaria Chemoprevention. N Engl J Med 2019; 380:2197-2206. [PMID: 30699301 DOI: 10.1056/nejmoa1811400] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND Mass administration of azithromycin for trachoma control led to a sustained reduction in all-cause mortality among Ethiopian children. Whether the addition of azithromycin to the monthly sulfadoxine-pyrimethamine plus amodiaquine used for seasonal malaria chemoprevention could reduce mortality and morbidity among African children was unclear. METHODS We randomly assigned children 3 to 59 months of age, according to household, to receive either azithromycin or placebo, together with sulfadoxine-pyrimethamine plus amodiaquine, during the annual malaria-transmission season in Burkina Faso and Mali. The drug combinations were administered in four 3-day cycles, at monthly intervals, for three successive seasons. The primary end point was death or hospital admission for at least 24 hours that was not due to trauma or elective surgery. Data were recorded by means of active and passive surveillance. RESULTS In July 2014, a total of 19,578 children were randomly assigned to receive seasonal malaria chemoprevention plus either azithromycin (9735 children) or placebo (9843 children); each year, children who reached 5 years of age exited the trial and new children were enrolled. In the intention-to-treat analysis, the overall number of deaths and hospital admissions during three malaria-transmission seasons was 250 in the azithromycin group and 238 in the placebo group (events per 1000 child-years at risk, 24.8 vs. 23.5; incidence rate ratio, 1.1; 95% confidence interval [CI], 0.88 to 1.3). Results were similar in the per-protocol analysis. The following events occurred less frequently with azithromycin than with placebo: gastrointestinal infections (1647 vs. 1985 episodes; incidence rate ratio, 0.85; 95% CI, 0.79 to 0.91), upper respiratory tract infections (4893 vs. 5763 episodes; incidence rate ratio, 0.85; 95% CI, 0.81 to 0.90), and nonmalarial febrile illnesses (1122 vs. 1424 episodes; incidence rate ratio, 0.79; 95% CI, 0.73 to 0.87). The prevalence of malaria parasitemia and incidence of adverse events were similar in the two groups. CONCLUSIONS Among children in Burkina Faso and Mali, the addition of azithromycin to the antimalarial agents used for seasonal malaria chemoprevention did not result in a lower incidence of death or hospital admission that was not due to trauma or surgery than antimalarial agents plus placebo, although a lower disease burden was noted with azithromycin than with placebo. (Funded by the Joint Global Health Trials scheme; ClinicalTrials.gov number, NCT02211729.).
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Affiliation(s)
- Daniel Chandramohan
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Alassane Dicko
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Issaka Zongo
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Issaka Sagara
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Matthew Cairns
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Irene Kuepfer
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Modibo Diarra
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Amadou Barry
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Amadou Tapily
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Frederic Nikiema
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Serge Yerbanga
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Samba Coumare
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Ismaila Thera
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Abdourhamane Traore
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Paul Milligan
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Halidou Tinto
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Ogobara Doumbo
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Jean-Bosco Ouedraogo
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
| | - Brian Greenwood
- From the London School of Hygiene and Tropical Medicine, London (D.C., M.C., I.K., P.M., B.G.); the Malaria Research and Training Center, University of Science, Techniques, and Technologies of Bamako, Bamako, Mali (A.D., I.S., M.D., A.B., A. Tapily, S.C., I.T., O.D.); and Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso (I.Z., F.N., S.Y., A. Traore, H.T., J.-B.O.)
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6
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Slater HC, Ross A, Felger I, Hofmann NE, Robinson L, Cook J, Gonçalves BP, Björkman A, Ouedraogo AL, Morris U, Msellem M, Koepfli C, Mueller I, Tadesse F, Gadisa E, Das S, Domingo G, Kapulu M, Midega J, Owusu-Agyei S, Nabet C, Piarroux R, Doumbo O, Doumbo SN, Koram K, Lucchi N, Udhayakumar V, Mosha J, Tiono A, Chandramohan D, Gosling R, Mwingira F, Sauerwein R, Paul R, Riley EM, White NJ, Nosten F, Imwong M, Bousema T, Drakeley C, Okell LC. The temporal dynamics and infectiousness of subpatent Plasmodium falciparum infections in relation to parasite density. Nat Commun 2019; 10:1433. [PMID: 30926893 PMCID: PMC6440965 DOI: 10.1038/s41467-019-09441-1] [Citation(s) in RCA: 92] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 03/07/2019] [Indexed: 02/08/2023] Open
Abstract
Malaria infections occurring below the limit of detection of standard diagnostics are common in all endemic settings. However, key questions remain surrounding their contribution to sustaining transmission and whether they need to be detected and targeted to achieve malaria elimination. In this study we analyse a range of malaria datasets to quantify the density, detectability, course of infection and infectiousness of subpatent infections. Asymptomatically infected individuals have lower parasite densities on average in low transmission settings compared to individuals in higher transmission settings. In cohort studies, subpatent infections are found to be predictive of future periods of patent infection and in membrane feeding studies, individuals infected with subpatent asexual parasite densities are found to be approximately a third as infectious to mosquitoes as individuals with patent (asexual parasite) infection. These results indicate that subpatent infections contribute to the infectious reservoir, may be long lasting, and require more sensitive diagnostics to detect them in lower transmission settings. The role of subpatent infections for malaria transmission and elimination is unclear. Here, Slater et al. analyse several malaria datasets to quantify the density, detectability, course of infection and infectiousness of subpatent infections.
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Affiliation(s)
- Hannah C Slater
- MRC Centre for Global Infectious Disease Analysis, Department of Infectious Disease Epidemiology, Imperial College London, London, W2 1PG, UK.
| | - Amanda Ross
- Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, 4002, Switzerland.,University of Basel, Basel, 4001, Switzerland
| | - Ingrid Felger
- University of Basel, Basel, 4001, Switzerland.,Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, Basel, 4002, Switzerland
| | - Natalie E Hofmann
- University of Basel, Basel, 4001, Switzerland.,Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, Basel, 4002, Switzerland
| | - Leanne Robinson
- Vector-borne Diseases Unit, Papua New Guinea Institute for Medical Research, Madang, Papua New Guinea.,Division of Population Health and Immunity, The Walter and Eliza Hall Institute of Medical Research, Parkville, 3052, VIC, Australia.,Medical Biology, University of Melbourne, Melbourne, 3010, VIC, Australia.,Disease Elimination, Burnet Institute, Melbourne, 3004, VIC, Australia
| | - Jackie Cook
- MRC Tropical Epidemiology Group, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK
| | - Bronner P Gonçalves
- Department of Immunology and Infection, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK
| | - Anders Björkman
- Malaria Research, Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, 171 77, Stockholm, Sweden
| | - Andre Lin Ouedraogo
- Département de Sciences Biomédicales, Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, 01 BP 2208, Burkina Faso.,Institute for Disease Modeling, Intellectual Ventures, Bellevue, 98005, Washington, USA
| | - Ulrika Morris
- Malaria Research, Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, 171 77, Stockholm, Sweden
| | - Mwinyi Msellem
- Department of Training and Research, Mnazi Mmoja Hospital, Zanzibar, Tanzania
| | - Cristian Koepfli
- Population Health and Immunity Division, Walter and Eliza Hall Institute, Melbourne, 3052, Victoria, Australia.,Department of Biological Sciences, University of Notre Dame, Indiana, 46556, USA
| | - Ivo Mueller
- Division of Population Health and Immunity, The Walter and Eliza Hall Institute of Medical Research, Parkville, 3052, VIC, Australia.,Department of Parasites and Insect Vectors, Institut Pasteur, Paris, 75015, France.,Medical Biology, University of Melbourne, Melbourne, 3010, VIC, Australia
| | - Fitsum Tadesse
- Radboud Institute for Health Sciences, Radboud University Medical Centre, Nijmegen, 6525, The Netherlands.,Armauer Hansen Research Institute, Addis Ababa, Ethiopia.,Institute of Biotechnology, Addis Ababa University, Addis Ababa, Ethiopia
| | | | - Smita Das
- Diagnostics Program, PATH, Seattle, Washington, 98121, United States of America
| | - Gonzalo Domingo
- Diagnostics Program, PATH, Seattle, Washington, 98121, United States of America
| | - Melissa Kapulu
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7FZ, UK.,KEMRI-Wellcome Trust Research Programme, Centre for Geographic Medicine Research-Coast, Kilifi, Kenya, Centre for Genomics and Global Health, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK
| | - Janet Midega
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7FZ, UK.,KEMRI-Wellcome Trust Research Programme, Centre for Geographic Medicine Research-Coast, Kilifi, Kenya, Centre for Genomics and Global Health, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK
| | - Seth Owusu-Agyei
- Institute of Health, University of Health and Allied Sciences, Hohoe, PMB 31, Ghana
| | - Cécile Nabet
- Sorbonne Université, INSERM, Institut Pierre-Louis d'Epidémiologie et de Santé Publique, AP- HP, Groupe Hospitalier Pitié-Salpêtrière, Service de Parasitologie-Mycologie, Paris, 75646, France
| | - Renaud Piarroux
- Sorbonne Université, INSERM, Institut Pierre-Louis d'Epidémiologie et de Santé Publique, AP- HP, Groupe Hospitalier Pitié-Salpêtrière, Service de Parasitologie-Mycologie, Paris, 75646, France
| | - Ogobara Doumbo
- Malaria Research and Training Centre, Parasitic Diseases Epidemiology Department, UMI 3189, University of Sciences, Technique and Technology, Bamako, Mali
| | - Safiatou Niare Doumbo
- Malaria Research and Training Centre, Parasitic Diseases Epidemiology Department, UMI 3189, University of Sciences, Technique and Technology, Bamako, Mali
| | - Kwadwo Koram
- Noguchi Memorial Institute for Medical Research, University of Ghana, Legon, Ghana
| | - Naomi Lucchi
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Global Health, Centers for Disease Control and Prevention, Atlanta, 30030, GA, United States of America
| | - Venkatachalam Udhayakumar
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Global Health, Centers for Disease Control and Prevention, Atlanta, 30030, GA, United States of America
| | - Jacklin Mosha
- National Institute for Medical Research, Mwanza Medical Research Centre, Mwanza, Tanzania
| | - Alfred Tiono
- Department of Biomedical Sciences, Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, 01 BP 2208, Burkina Faso
| | - Daniel Chandramohan
- Department of Disease Control, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK
| | - Roly Gosling
- Malaria Elimination Initiative, Global Health Group, University of California, San Francisco, San Francisco, 94158, CA, United States
| | - Felista Mwingira
- Biological Sciences Department, Dar es Salaam University College of Education, P. O. Box 2329, Dar es Salaam, Tanzania
| | - Robert Sauerwein
- Radboud Institute for Health Sciences, Radboud University Medical Centre, Nijmegen, 6525, The Netherlands
| | - Richard Paul
- Institut Pasteur de Dakar, Laboratoire d'Entomologie Médicale, Dakar, Senegal
| | - Eleanor M Riley
- Department of Immunology and Infection, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK.,The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK
| | - Nicholas J White
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7FZ, UK.,Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand
| | - Francois Nosten
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7FZ, UK.,Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, 63110, Thailand
| | - Mallika Imwong
- Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand.,Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand
| | - Teun Bousema
- Department of Immunology and Infection, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK.,Radboud Institute for Health Sciences, Radboud University Medical Centre, Nijmegen, 6525, The Netherlands
| | - Chris Drakeley
- Department of Immunology and Infection, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK
| | - Lucy C Okell
- MRC Centre for Global Infectious Disease Analysis, Department of Infectious Disease Epidemiology, Imperial College London, London, W2 1PG, UK
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Healy SA, Fried M, Richie T, Bok K, Little M, August A, Riley L, Swamy GK, Wylie BJ, Menendez C, Muehlenbachs A, Doumbo O, Greenwood B, Billingsley PF, Hoffman SL, Duffy PE. Malaria vaccine trials in pregnant women: An imperative without precedent. Vaccine 2019; 37:763-770. [PMID: 30621913 DOI: 10.1016/j.vaccine.2018.12.025] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 12/11/2018] [Accepted: 12/13/2018] [Indexed: 11/28/2022]
Abstract
Pregnant women are highly susceptible to Plasmodium falciparum malaria, leading to substantial maternal, perinatal, and infant mortality. While malaria vaccine development has made significant progress in recent years, no trials of malaria vaccines have ever been conducted in pregnant women. In December 2016, an expert meeting was convened at NIAID, NIH, in Rockville, Maryland to deliberate on the rationale and design of malaria vaccine trials in pregnant women. The discussions highlighted the progress made over recent years in the field of maternal immunization for other infectious diseases, and the evolving regulatory and ethical environment, all of which support a new emphasis on testing malaria vaccines that offer direct benefits to pregnant women. Initial safety and immunogenicity studies of malaria vaccines will be conducted in non-pregnant adult volunteers. Subsequently, efficacy trials involving pregnant women will likely be conducted in malaria-endemic and often resource-poor environments where sufficiently high malaria incidence will allow vaccine activity to be measured. Such trials will need to meet all international standards to ensure the safety of mother and offspring, under oversight of appropriate ethical and regulatory bodies. The convened experts drafted a clinical development plan to test a malaria vaccine product during pregnancy, using as a case study PfSPZ Vaccine being developed by Sanaria Inc. that is currently in phase 2 testing. Following the expert recommendations, a pregnancy registry has been initiated in Ouelessebougou, Mali, to provide baseline information on maternal and fetal outcomes as a context for evaluating PfSPZ Vaccine safety in the future, and new regimens are being assessed that will be suitable for evaluation in pregnant women.
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Affiliation(s)
- Sara A Healy
- Laboratory of Malaria Immunology and Vaccinology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
| | - Michal Fried
- Laboratory of Malaria Immunology and Vaccinology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
| | | | - Karin Bok
- National Vaccine Program Office (NVPO), Office of Assistant Secretary for Health, Washington, D.C., USA
| | - Maggie Little
- Kennedy Institute of Ethics, Georgetown University, Washington, D.C., USA
| | - Allison August
- Clinical Development, Moderna Therapeutics, Cambridge, MA, USA
| | - Laura Riley
- Obstetrics, Massachusetts General Hospital, Boston, MA, USA
| | - Geeta K Swamy
- Department of Obstetrics & Gynecology, Duke University, Durham, NC, USA
| | - Blair J Wylie
- Maternal-Fetal Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - Clara Menendez
- Barcelona Institute for Global Health (ISGlobal), Hospital Clinic-Universitat de Barcelona, Spain
| | | | - Ogobara Doumbo
- Malaria Research and Training Center, Université de Bamako, Mali, Bamako, Mali
| | | | | | | | - Patrick E Duffy
- Laboratory of Malaria Immunology and Vaccinology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA.
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8
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Kayentao K, Florey LS, Mihigo J, Doumbia A, Diallo A, Koné D, Doumbo O, Eckert E. Impact evaluation of malaria control interventions on morbidity and all-cause child mortality in Mali, 2000-2012. Malar J 2018; 17:424. [PMID: 30428880 PMCID: PMC6236933 DOI: 10.1186/s12936-018-2573-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 11/09/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Major investments have been made since 2001, with intensification of malaria control interventions after 2006. Interventions included free distribution of insecticide-treated nets (ITN) to pregnant women and children under 5 years old, the introduction of artemisinin combination therapy (ACT) for malaria treatment, and indoor residual spraying of insecticides. Funders include the Government of Mali, the Global Fund to Fight AIDS, Tuberculosis and Malaria, and the US President's Malaria Initiative. METHODS Data from nationally representative household surveys conducted from 2000 to 2015 was used to performed the trend analysis for malaria intervention coverage, prevalence of morbidities among children under 5 years old [parasitemia and severe anaemia (< 8 g/dl)], and all-cause mortality of children under 5 (ACCM). Prevalence of contextual factors likely to contribute to ACCM were also assessed. The impact of these interventions was assessed on malaria morbidity and mortality using a plausibility argument. With the assumption that malaria contributes significantly to under-five mortality in settings with high malaria transmission, associations between malaria control interventions and all-cause under-five mortality (ACCM) were assessed taking into account other contextual factors related to child survival. RESULTS Intervention coverage improved significantly from 2006 to 2012. Household ownership of ITN increased from 49% in 2006 to 84% in 2012. ITN use also increased over the same period, from 26% in 2006 to 69% in 2012 among children under 5 and from 28% in 2006 to 73% in 2012 among pregnant women. The coverage of intermittent preventive treatment in pregnancy (IPTp) using two or more doses of SP increased from 10% in 2006 to 29% in 2012. In 2010, 23% of febrile children under 5 received ACT, as opposed to 19% in 2012. The prevalence of Plasmodium falciparum infection increased from 2010 (38.6%) to 2012 (51.6%), followed by a decrease in 2015 (35.8%). The prevalence of severe anaemia decreased from 2010 (26.3%) to 2012 (20.6%) and continued to decline in 2015 (19.9%). An impressive decline in ACCM was observed, from 225 in 1997-2001 to 192 in 2002-2006 and 95 in 2008-2012. Changes in contextual factors such as climate, socio-economic, nutrition, and coverage of maternal and child health interventions over the evaluation period did not favour reductions in ACCM, and are therefore unlikely to explain the observed results. CONCLUSIONS Taken as a whole, the evidence supports the conclusion that malaria control interventions substantially contributed to the observed decline in ACCM in Mali from 2000 to 2012, even in the context of continued high prevalence of parasitaemia explained by contextual factors such as climate change and political instability.
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Affiliation(s)
- Kassoum Kayentao
- Malaria Research and Training Center (MRTC), University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali.
| | - Lia S Florey
- President's Malaria Initiative (PMI), U.S. Agency for International Development (USAID), Washington, District of Columbia, USA
| | - Jules Mihigo
- US President's Malaria Initiative, United States Agency for International Development (USAID), Bamako, Mali
| | | | - Aliou Diallo
- US President's Malaria Initiative, United States Agency for International Development (USAID), Bamako, Mali
| | - Diakalia Koné
- National Malaria Control Programme (NMCP), Bamako, Mali
| | - Ogobara Doumbo
- Malaria Research and Training Center (MRTC), University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
| | - Erin Eckert
- President's Malaria Initiative (PMI), U.S. Agency for International Development (USAID), Washington, District of Columbia, USA
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9
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Niare S, Tandina F, Davoust B, Doumbo O, Raoult D, Parola P, Almeras L. Accurate identification of Anopheles gambiae Giles trophic preferences by MALDI-TOF MS. Infection, Genetics and Evolution 2018; 63:410-419. [DOI: 10.1016/j.meegid.2017.09.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 09/07/2017] [Accepted: 09/09/2017] [Indexed: 01/25/2023]
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10
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Tandina F, Doumbo O, Yaro AS, Traoré SF, Parola P, Robert V. Mosquitoes (Diptera: Culicidae) and mosquito-borne diseases in Mali, West Africa. Parasit Vectors 2018; 11:467. [PMID: 30103823 PMCID: PMC6090629 DOI: 10.1186/s13071-018-3045-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Accepted: 08/01/2018] [Indexed: 11/16/2022] Open
Abstract
Mosquito-borne diseases cause major human diseases in almost every part of the world. In West Africa, and notably in Mali, vector control measures help reduce the impact of mosquito-borne diseases, although malaria remains a threat to both morbidity and mortality. The most recent overview article on mosquitoes in Mali was published in 1961, with a total of 88 species. Our present review focuses on mosquitoes of medical importance among which the Anopheles vectors of Plasmodium and filaria, as well as the Culex and Aedes vectors of arboviruses. It aims to provide a concise update of the literature on Culicidae, covering the ecological areas in which the species are found but also the transmitted pathogens and recent innovative tools for vector surveys. This review highlights the recent introduction of invasive mosquito species, including Aedes albopictus and Culex neavei. The comprehensive list of mosquito species currently recorded includes 106 species (28 species of the Anophelinae and 78 species of the Culicinae). There are probable gaps in our knowledge concerning mosquitoes of the subfamily Culicinae and northern half of Mali because most studies have been carried out on the genus Anopheles and have taken place in the southern part of the country. It is hoped that this review may be useful to decision makers responsible for vector control strategies and to researchers for future surveys on mosquitoes, particularly the vectors of emerging arboviruses.
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Affiliation(s)
- Fatalmoudou Tandina
- Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, IHU-Méditerranée Infection, Marseille, France
- Department of Epidemiology of Parasitic Diseases, Malaria Research and Training Center, Faculty of Sciences and Techniques, University of Science, Techniques and Technologies of Bamako, Bamako, Mali
| | - Ogobara Doumbo
- Department of Epidemiology of Parasitic Diseases, Malaria Research and Training Center, Faculty of Sciences and Techniques, University of Science, Techniques and Technologies of Bamako, Bamako, Mali
| | - Alpha Seydou Yaro
- Department of Epidemiology of Parasitic Diseases, Malaria Research and Training Center, Faculty of Sciences and Techniques, University of Science, Techniques and Technologies of Bamako, Bamako, Mali
| | - Sékou F. Traoré
- Department of Epidemiology of Parasitic Diseases, Malaria Research and Training Center, Faculty of Sciences and Techniques, University of Science, Techniques and Technologies of Bamako, Bamako, Mali
| | - Philippe Parola
- Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, IHU-Méditerranée Infection, Marseille, France
| | - Vincent Robert
- MIVEGEC Unit, IRD-CNRS-Univ. Montpellier, Montpellier, France
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11
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Bhattacharya J, Pappas K, Toz B, Aranow C, Mackay M, Gregersen PK, Doumbo O, Traore AK, Lesser ML, McMahon M, Utset T, Silverman E, Levy D, McCune WJ, Jolly M, Wallace D, Weisman M, Romero-Diaz J, Diamond B. Serologic features of cohorts with variable genetic risk for systemic lupus erythematosus. Mol Med 2018; 24:24. [PMID: 30134810 PMCID: PMC6016868 DOI: 10.1186/s10020-018-0019-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 04/03/2018] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Systemic lupus erythematosus (SLE) is an autoimmune disease with genetic, hormonal, and environmental influences. In Western Europe and North America, individuals of West African descent have a 3-4 fold greater incidence of SLE than Caucasians. Paradoxically, West Africans in sub-Saharan Africa appear to have a low incidence of SLE, and some studies suggest a milder disease with less nephritis. In this study, we analyzed sera from African American female SLE patients and four other cohorts, one with SLE and others with varying degrees of risk for SLE in order to identify serologic factors that might correlate with risk of or protection against SLE. METHODS Our cohorts included West African women with previous malaria infection assumed to be protected from development of SLE, clinically unaffected sisters of SLE patients with high risk of developing SLE, healthy African American women with intermediate risk, healthy Caucasian women with low risk of developing SLE, and women with a diagnosis of SLE. We developed a lupus risk index (LRI) based on titers of IgM and IgG anti-double stranded DNA antibodies and levels of C1q. RESULTS The risk index was highest in SLE patients; second highest in unaffected sisters of SLE patients; third highest in healthy African-American women and lowest in healthy Caucasian women and malaria-exposed West African women. CONCLUSION This risk index may be useful in early interventions to prevent SLE. In addition, it suggests new therapeutic approaches for the treatment of SLE.
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Affiliation(s)
- Jyotsna Bhattacharya
- The Feinstein Institute for Medical Research, Center for Autoimmune, Musculoskeletal and Hematopoietic Diseases, 350 Community Dr, Manhasset, NY, 11030, USA
| | - Karalyn Pappas
- Department of Statistical Science, Cornell University, Ithaca, NY, USA
| | - Bahtiyar Toz
- Department of Internal Medicine, Istanbul University, Istanbul, Turkey
| | - Cynthia Aranow
- The Feinstein Institute for Medical Research, Center for Autoimmune, Musculoskeletal and Hematopoietic Diseases, 350 Community Dr, Manhasset, NY, 11030, USA
| | - Meggan Mackay
- The Feinstein Institute for Medical Research, Center for Autoimmune, Musculoskeletal and Hematopoietic Diseases, 350 Community Dr, Manhasset, NY, 11030, USA
| | - Peter K Gregersen
- The Feinstein Institute for Medical Research, Center for Genomics and Human Genetics, Manhasset, NY, USA
| | | | - Abdel Kader Traore
- Deputy of the Department of Internal Medicine, University Hospital, Bamako, Mali
| | - Martin L Lesser
- The Feinstein Institute for Medical Research, Center of Biostatistics Unit Manhasset, Manhasset, NY, USA
| | - Maureen McMahon
- UCLA David Geffen School of Medicine, Los Angeles, CA, 90095, USA
| | - Tammy Utset
- University of Chicago Medical Center, Chicago, IL, USA
| | - Earl Silverman
- Hospital for Sick Children, University of Toronto, Toronto, ON M5G, 1X8, Canada
| | - Deborah Levy
- Hospital for Sick Children, University of Toronto, Toronto, ON M5G, 1X8, Canada
| | | | | | - Daniel Wallace
- Cedars Sinai Medical Center, Los Angeles, CA, 90048, USA
| | | | - Juanita Romero-Diaz
- Instituto Nacional de Ciencias Medicas y Nutrician Salvador Zubiran, Mexico City, Mexico
| | - Betty Diamond
- The Feinstein Institute for Medical Research, Center for Autoimmune, Musculoskeletal and Hematopoietic Diseases, 350 Community Dr, Manhasset, NY, 11030, USA.
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12
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Guindo A, Sagara I, Ouédraogo B, Dicko A, Sallah K, Doumbo O, Gaudart J. Modélisation de l’hétérogénéité spatiale de l’exposition : essais cliniques dans le contexte du paludisme. Rev Epidemiol Sante Publique 2018. [DOI: 10.1016/j.respe.2018.03.342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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13
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Hou X, Byrne-Steele ML, Pan W, Brown B, Sanders M, Eisenhower M, Coelho C, Hurtado PG, Doritchamou Y, Highsmith K, Taylor JJ, Schwartz A, Morrison B, Muratova O, Sagara I, Doumbo O, Anderson C, Fried M, Duffy PE, Han J. Identification of paired heavy and light chains from single B-cells from immunized Malian adults with rapid functional confirmation using iPair-BCR™, NGS, and iScreen™. The Journal of Immunology 2018. [DOI: 10.4049/jimmunol.200.supp.174.36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Abstract
Information about the cognate pairing of TCR alpha-beta chains and BCR IgH and IgKL chains encoded by individual T and B cells is key to understanding adaptive immune responses and developing therapeutic applications. We have previously reported the development of a sensitive technology that allows the amplification and identification of the paired human TCR alpha and beta chains from single T cells, termed iPair-TCR. Here, we report the extension of this technology to identify paired human BCR IgH and IgKL chains from antigen-specific single B cells. In this proof of concept study, we identified paired-VDJ-receptors from antigen-specific B-cells from nine Pfs230-EPA immunized Malian adults using the iPair-BCR method. Next, we developed a method to rapidly generate Fab fragments and demonstrate the binding of several of these single cell targets to the original Pfs230 antigen. Single cells of interest were identified based upon their repeated frequency on the plate, which indicates a clonal selection. The corresponding heavy and light chains were PCR amplified from selected wells. Using overlap extension PCR, all necessary elements for in vitro transcription and translation and either the CH1 or C-kappa-domain were added to both the 5′ and 3′ ends of the single cell VDJ. After in vitro transcription and translation, four out of five tested Fab fragments demonstrated binding through a colorimetric ELISA assay. The overall process after VDJ identification can be performed in under a week indicating the utility of our technology for rapid identification of antigen-specific BCRs and functional binding characteristics.
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Abstract
Infectious diseases represent one of the greatest potential barriers to achievement of the third Sustainable Development Goals in African countries and around the world because they continue to pose major public health challenges. The surveillance of infectious diseases has recently assumed greater importance in most African countries, both because of the emergence of infectious diseases and because strains of pathogens that cause tuberculosis, malaria, cholera, dysentery, and pneumonia have developed resistance to common and inexpensive antimicrobial drugs. However, data on the pathogen-specific causes of infectious diseases are limited. Developing research in infectious and tropical diseases in Africa is urgently needed to better describe the distribution of pathogen-borne diseases and to know which pathogens actually cause fever. This research is critical for guiding treatment and policies in Africa. More effective diagnostics are also needed for these diseases, which often are misdiagnosed or diagnosed too late. A comprehensive review of this type of research is presented here.
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Affiliation(s)
- Cheikh Sokhna
- Aix-Marseille Univ, Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), Institut Hospitlao-Universitaire (IHU)Méditerranée-Infection
| | - Oumar Gaye
- Service Parasitologie, Université Cheikh Anta Diop, Dakar, Senegal
| | - Ogobara Doumbo
- Department of Epidemiology of Infectious Diseases, Faculty of Medicine, Pharmacy and Dentistry, University of Techniques and Technologies of Bamako, Mali
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15
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Niare S, Almeras L, Tandina F, Yssouf A, Bacar A, Toilibou A, Doumbo O, Raoult D, Parola P. MALDI-TOF MS identification of Anopheles gambiae Giles blood meal crushed on Whatman filter papers. PLoS One 2017; 12:e0183238. [PMID: 28817629 PMCID: PMC5560667 DOI: 10.1371/journal.pone.0183238] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 08/01/2017] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Identification of the source of mosquito blood meals is an important component for disease control and surveillance. Recently, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) profiling has emerged as an effective tool for mosquito blood meal identification, using the abdomens of freshly engorged mosquitoes. In the field, mosquito abdomens are crushed on Whatman filter papers to determine the host feeding patterns by identifying the origin of their blood meals. The aim of this study was to test whether crushing engorged mosquito abdomens on Whatman filter papers was compatible with MALDI-TOF MS for mosquito blood meal identification. Both laboratory reared and field collected mosquitoes were tested. MATERIAL AND METHODS Sixty Anopheles gambiae Giles were experimentally engorged on the blood of six distinct vertebrate hosts (human, sheep, rabbit, dog, chicken and rat). The engorged mosquito abdomens were crushed on Whatman filter papers for MALDI-TOF MS analysis. 150 Whatman filter papers, with mosquitoes engorged on cow and goat blood, were preserved. A total of 77 engorged mosquito abdomens collected in the Comoros Islands and crushed on Whatman filter papers were tested with MALDI-TOF MS. RESULTS The MS profiles generated from mosquito engorged abdomens crushed on Whatman filter papers exhibited high reproducibility according to the original host blood. The blood meal host was correctly identified from mosquito abdomens crushed on Whatman filter papers by MALDI-TOF MS. The MS spectra obtained after storage were stable regardless of the room temperature and whether or not they were frozen. The MS profiles were reproducible for up to three months. For the Comoros samples, 70/77 quality MS spectra were obtained and matched with human blood spectra. This was confirmed by molecular tools. CONCLUSION The results demonstrated that MALDI-TOF MS could identify mosquito blood meals from Whatman filter papers collected in the field during entomological surveys. The application of MALDI-TOF MS has proved to be rapid and successful, making it a new and efficient tool for mosquito-borne disease surveillance.
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Affiliation(s)
- Sirama Niare
- Aix Marseille Université, Unité de Recherche en Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63, CNRS 7278, IRD 198 (Dakar, Sénégal), Inserm 1095, AP-HM, IHU Méditerranée Infection, Marseille, France
- Malaria Research and Training Center, DEAP/FMOS, UMI 3189, University of Science, Techniques and Technology, Bamako, Mali
| | - Lionel Almeras
- Aix Marseille Université, Unité de Recherche en Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63, CNRS 7278, IRD 198 (Dakar, Sénégal), Inserm 1095, AP-HM, IHU Méditerranée Infection, Marseille, France
- Unité de Parasitologie et d’Entomologie, Département des Maladies Infectieuses, Institut de Recherche Biomédicale des Armées, Marseille, France
| | - Fatalmoudou Tandina
- Aix Marseille Université, Unité de Recherche en Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63, CNRS 7278, IRD 198 (Dakar, Sénégal), Inserm 1095, AP-HM, IHU Méditerranée Infection, Marseille, France
- Malaria Research and Training Center, DEAP/FMOS, UMI 3189, University of Science, Techniques and Technology, Bamako, Mali
| | - Amina Yssouf
- Malaria Control Program, Moroni, Union of the Comoros
| | - Affane Bacar
- Malaria Control Program, Moroni, Union of the Comoros
| | - Ali Toilibou
- Malaria Control Program, Moroni, Union of the Comoros
| | - Ogobara Doumbo
- Malaria Research and Training Center, DEAP/FMOS, UMI 3189, University of Science, Techniques and Technology, Bamako, Mali
| | - Didier Raoult
- Aix Marseille Université, Unité de Recherche en Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63, CNRS 7278, IRD 198 (Dakar, Sénégal), Inserm 1095, AP-HM, IHU Méditerranée Infection, Marseille, France
| | - Philippe Parola
- Aix Marseille Université, Unité de Recherche en Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63, CNRS 7278, IRD 198 (Dakar, Sénégal), Inserm 1095, AP-HM, IHU Méditerranée Infection, Marseille, France
- * E-mail:
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Cabantous S, Doumbo O, Poudiougou B, Louis L, Barry A, Oumar AA, Traore A, Marquet S, Dessein A. Gene Expression Analysis Reveals Genes Common to Cerebral Malaria and Neurodegenerative Disorders. J Infect Dis 2017; 216:771-775. [DOI: 10.1093/infdis/jix359] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 07/24/2017] [Indexed: 11/12/2022] Open
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17
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Diarra AZ, Almeras L, Laroche M, Berenger JM, Koné AK, Bocoum Z, Dabo A, Doumbo O, Raoult D, Parola P. Molecular and MALDI-TOF identification of ticks and tick-associated bacteria in Mali. PLoS Negl Trop Dis 2017; 11:e0005762. [PMID: 28742123 PMCID: PMC5542699 DOI: 10.1371/journal.pntd.0005762] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 08/03/2017] [Accepted: 06/30/2017] [Indexed: 12/14/2022] Open
Abstract
Ticks are considered the second vector of human and animal diseases after mosquitoes. Therefore, identification of ticks and associated pathogens is an important step in the management of these vectors. In recent years, Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has been reported as a promising method for the identification of arthropods including ticks. The objective of this study was to improve the conditions for the preparation of tick samples for their identification by MALDI-TOF MS from field-collected ethanol-stored Malian samples and to evaluate the capacity of this technology to distinguish infected and uninfected ticks. A total of 1,333 ticks were collected from mammals in three distinct sites from Mali. Morphological identification allowed classification of ticks into 6 species including Amblyomma variegatum, Hyalomma truncatum, Hyalomma marginatum rufipes, Rhipicephalus (Boophilus) microplus, Rhipicephalus evertsi evertsi and Rhipicephalus sanguineus sl. Among those, 471 ticks were randomly selected for molecular and proteomic analyses. Tick legs submitted to MALDI-TOF MS revealed a concordant morpho/molecular identification of 99.6%. The inclusion in our MALDI-TOF MS arthropod database of MS reference spectra from ethanol-preserved tick leg specimens was required to obtain reliable identification. When tested by molecular tools, 76.6%, 37.6%, 20.8% and 1.1% of the specimens tested were positive for Rickettsia spp., Coxiella burnetii, Anaplasmataceae and Borrelia spp., respectively. These results support the fact that MALDI-TOF is a reliable tool for the identification of ticks conserved in alcohol and enhances knowledge about the diversity of tick species and pathogens transmitted by ticks circulating in Mali.
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Affiliation(s)
- Adama Zan Diarra
- Aix Marseille Université, UM63, CNRS 7278, IRD 198, INSERM 1095, AP-HM, IHU - Méditerranée Infection, Marseille, France
- Malaria Research and Training Center, Département d’Epidémiologie des Affections Parasitaires, Faculté de Médecine et d’Odontostomatologie, Faculté de Pharmacie, USTTB, Bamako, Mali
| | - Lionel Almeras
- Aix Marseille Université, UM63, CNRS 7278, IRD 198, INSERM 1095, AP-HM, IHU - Méditerranée Infection, Marseille, France
- Unité de Parasitologie et Entomologie, Département des Maladies Infectieuses, Institut de Recherche Biomédicale des Armées, Marseille, France
| | - Maureen Laroche
- Aix Marseille Université, UM63, CNRS 7278, IRD 198, INSERM 1095, AP-HM, IHU - Méditerranée Infection, Marseille, France
| | - Jean-Michel Berenger
- Aix Marseille Université, UM63, CNRS 7278, IRD 198, INSERM 1095, AP-HM, IHU - Méditerranée Infection, Marseille, France
| | - Abdoulaye K. Koné
- Malaria Research and Training Center, Département d’Epidémiologie des Affections Parasitaires, Faculté de Médecine et d’Odontostomatologie, Faculté de Pharmacie, USTTB, Bamako, Mali
| | | | - Abdoulaye Dabo
- Malaria Research and Training Center, Département d’Epidémiologie des Affections Parasitaires, Faculté de Médecine et d’Odontostomatologie, Faculté de Pharmacie, USTTB, Bamako, Mali
| | - Ogobara Doumbo
- Malaria Research and Training Center, Département d’Epidémiologie des Affections Parasitaires, Faculté de Médecine et d’Odontostomatologie, Faculté de Pharmacie, USTTB, Bamako, Mali
| | - Didier Raoult
- Aix Marseille Université, UM63, CNRS 7278, IRD 198, INSERM 1095, AP-HM, IHU - Méditerranée Infection, Marseille, France
| | - Philippe Parola
- Aix Marseille Université, UM63, CNRS 7278, IRD 198, INSERM 1095, AP-HM, IHU - Méditerranée Infection, Marseille, France
- * E-mail:
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18
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Coulibaly MB, Gabriel EE, Sinaba Y, Sylla D, Sacko A, Sylla L, Coulibaly B, Hume JCC, Baber I, Assadou MH, Sagara I, Wu Y, Healy SA, Doumbo O, Traore SF, Duffy PE. Optimizing Direct Membrane and Direct Skin Feeding Assays for Plasmodium falciparum Transmission-Blocking Vaccine Trials in Bancoumana, Mali. Am J Trop Med Hyg 2017; 97:719-725. [PMID: 28722588 DOI: 10.4269/ajtmh.16-1000] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Malaria transmission-blocking vaccines (TBV) have been evaluated in field trials in Mali since 2013. However, the assays currently used to measure serum antibody TB activity (TBA) after vaccination are highly variable, in part due to the lack of optimization and standardization for field assays in which mosquitoes feed on gametocytemic blood. Herein, we report a study conducted in Bancoumana village, Mali, where we identify and optimize the parameters that contribute to successful mosquito feeding outcomes in both direct skin feeds (DSFs) and direct membrane feeding assays (DMFA). These parameters include: 1) mosquito age, 2) duration of mosquito starvation prior to feeding, 3) membrane selection for DMFA, 4) anatomical location of DSF feeding (arm, calf, and ankle), and 5) time of day for DSF (dawn or dusk). We found that younger mosquitoes were significantly associated with higher feeding, survival, and infection rates. Longer starvation times were positively, but not significantly, associated with higher infection rates, but were negatively associated with feeding and survival. Membrane type and body location did not affect infection outcome significantly. Although dusk was found to be associated with higher infection rates, this may be confounded by the time from positive blood smear. Based on these findings, we make specific recommendations for optimal feeding parameters in the different assay types to maximize the chance of detecting parasite transmission in a standardized manner.
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Affiliation(s)
- Mamadou B Coulibaly
- Malaria Research and Training Center, ICER-MALI-USTTB-NIAID/NIH, Bamako, Mali
| | - Erin E Gabriel
- Biostatistics Research Branch, NIAID/NIH, Bethesda, Maryland
| | - Youssouf Sinaba
- Malaria Research and Training Center, ICER-MALI-USTTB-NIAID/NIH, Bamako, Mali
| | - Daman Sylla
- Malaria Research and Training Center, ICER-MALI-USTTB-NIAID/NIH, Bamako, Mali
| | - Adama Sacko
- Malaria Research and Training Center, ICER-MALI-USTTB-NIAID/NIH, Bamako, Mali
| | - Lakamy Sylla
- Malaria Research and Training Center, ICER-MALI-USTTB-NIAID/NIH, Bamako, Mali
| | - Boubacar Coulibaly
- Malaria Research and Training Center, ICER-MALI-USTTB-NIAID/NIH, Bamako, Mali
| | - Jen C C Hume
- Laboratory of Malaria Immunology and Vaccinology, NIAID/NIH, Bethesda, Maryland
| | - Ibrahima Baber
- Abt Associates Inc., Monrovia, Liberia.,Malaria Research and Training Center, ICER-MALI-USTTB-NIAID/NIH, Bamako, Mali
| | | | - Issaka Sagara
- Malaria Research and Training Center, ICER-MALI-USTTB-NIAID/NIH, Bamako, Mali
| | - Yimin Wu
- PATH-Malaria Vaccine Initiative, Washington, District of Columbia.,Laboratory of Malaria Immunology and Vaccinology, NIAID/NIH, Bethesda, Maryland
| | - Sara A Healy
- Laboratory of Malaria Immunology and Vaccinology, NIAID/NIH, Bethesda, Maryland
| | - Ogobara Doumbo
- Malaria Research and Training Center, ICER-MALI-USTTB-NIAID/NIH, Bamako, Mali
| | - Sekou F Traore
- Malaria Research and Training Center, ICER-MALI-USTTB-NIAID/NIH, Bamako, Mali
| | - Patrick E Duffy
- Laboratory of Malaria Immunology and Vaccinology, NIAID/NIH, Bethesda, Maryland
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19
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Greenwood B, Dicko A, Sagara I, Zongo I, Tinto H, Cairns M, Kuepfer I, Milligan P, Ouedraogo JB, Doumbo O, Chandramohan D. Seasonal vaccination against malaria: a potential use for an imperfect malaria vaccine. Malar J 2017; 16:182. [PMID: 28464937 PMCID: PMC5414195 DOI: 10.1186/s12936-017-1841-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 04/26/2017] [Indexed: 11/29/2022] Open
Abstract
In many parts of the African Sahel and sub-Sahel, where malaria remains a major cause of mortality and morbidity, transmission of the infection is highly seasonal. Seasonal malaria chemoprevention (SMC), which involves administration of a full course of malaria treatment to young children at monthly intervals during the high transmission season, is proving to be an effective malaria control measure in these areas. However, SMC does not provide complete protection and it is demanding to deliver for both families and healthcare givers. Furthermore, there is a risk of the emergence in the future of resistance to the drugs, sulfadoxine-pyrimethamine and amodiaquine, that are currently being used for SMC. Substantial progress has been made in the development of malaria vaccines during the past decade and one malaria vaccine, RTS,S/AS01, has received a positive opinion from the European Medicines Authority and will soon be deployed in large-scale, pilot implementation projects in sub-Saharan Africa. A characteristic feature of this vaccine, and potentially of some of the other malaria vaccines under development, is that they provide a high level of efficacy during the period immediately after vaccination, but that this wanes rapidly, perhaps because it is difficult to develop effective immunological memory to malaria antigens in subjects exposed previously to malaria infection. A potentially effective way of using malaria vaccines with high initial efficacy but which provide only a short period of protection could be annual, mass vaccination campaigns shortly before each malaria transmission season in areas where malaria transmission is confined largely to a few months of the year.
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Affiliation(s)
- Brian Greenwood
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel St., London, WC1E 7HT UK
| | - Alassane Dicko
- Malaria Research and Training Centre, University of Sciences Techniques and Technologies, Bamako, Mali
| | - Issaka Sagara
- Malaria Research and Training Centre, University of Sciences Techniques and Technologies, Bamako, Mali
| | - Issaka Zongo
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso
| | - Halidou Tinto
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso
| | - Matthew Cairns
- Faculty of Epidemiology and Public Health, London School of Hygiene and Tropical Medicine, London, UK
| | - Irene Kuepfer
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel St., London, WC1E 7HT UK
| | - Paul Milligan
- Faculty of Epidemiology and Public Health, London School of Hygiene and Tropical Medicine, London, UK
| | | | - Ogobara Doumbo
- Malaria Research and Training Centre, University of Sciences Techniques and Technologies, Bamako, Mali
| | - Daniel Chandramohan
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel St., London, WC1E 7HT UK
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Kone A, Dara A, Niangaly A, Sinha I, Brodin D, Fofana B, Dama S, Dembele D, Sidibe B, Diallo N, Thera M, Sagara I, Wright K, Björkman A, Gil J, Doumbo O, Djimde A. EFFECT OF ARTESUNATE MONOTHERAPY ON PLASMODIUM FALCIPARUMIN VIVO GENOMIC EXPRESSION. BMJ Glob Health 2017. [DOI: 10.1136/bmjgh-2016-000260.43] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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21
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Sissoko S, Kone A, Fofana B, Sangaré C, Dembele D, Toure S, Sanogo K, Diakite H, Toure S, Doumbia D, Haidara K, Doumbo O, Djimde A. PF3D7_1343700 KELCH PROPELLER (K13-PROPELLER) POLYMORPHISMS AND ARTESUNATE MONOTHERAPY EFFICACY IN UNCOMPLICATED MALARIA TREATMENT IN MALI. BMJ Glob Health 2017. [DOI: 10.1136/bmjgh-2016-000260.45] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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22
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Djimde M, Vaillant M, Samouda H, Sagara I, Djimde A, Doumbo O. WEIGHT STATUS ROLE ON ANTIMALARIAL DRUG EFFICACY AND SAFETY IN SUBURBAN CHILD POPULATION IN MALI. BMJ Glob Health 2017. [DOI: 10.1136/bmjgh-2016-000260.78] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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23
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Diawara E, Beavogui A, Camara D, Sylla M, Yattara M, Sow A, Camara GC, Diallo S, Doumbo O, Djimde A. IMPACT OF TREATMENT OF UNCOMPLICATED MALARIA BY AMODIAQUINE−ARTESUNATE (AS-AQ) ON PFCRT 76T AND PFMDR1 86Y MUTATIONS SELECTION IN PLASMODIUM FALCIPARUMISOLATES, REPUBLIC OF GUINEA. BMJ Glob Health 2017. [DOI: 10.1136/bmjgh-2016-000260.56] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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24
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Fofana B, Djimde A, Diakité H, Sagara I, Doumbo O, Toure S, Sanogo K. TIME TO SECOND AND THIRD EPISODES OF MALARIA OF DIHYDROARTEMISININ−PIPERAQUINE VSARTESUNATE−AMODIAQUINE AND ARTESUNATE−PYRONARIDINE VSARTEMETER−LUMEFANTRINE IN BOUGOULA HAMEAU, MALI. BMJ Glob Health 2017. [DOI: 10.1136/bmjgh-2016-000260.64] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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25
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Maiga H, Lasry E, Diarra M, Sagara I, Bamadio A, Traore A, Coumare S, Soma B, Dicko Y, Diallo N, Sangare B, Tembely A, Traore D, Niangaly H, Dao F, Haidara A, Dicko A, Doumbo O, Djimde A. SEASONAL MALARIA CHEMOPREVENTION WITH SULPHADOXINE-PYRIMETHAMINE AND AMODIAQUINE SELECTS DHFR-DHPS QUINTUPLE MUTANT GENOTYPE IN MALI. BMJ Glob Health 2017. [DOI: 10.1136/bmjgh-2016-000260.55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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26
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Marquet S, Conte I, Poudiougou B, Argiro L, Dessein H, Couturier C, Burté F, Oumar AA, Brown BJ, Traore A, Afolabi NK, Barry A, Omokhodion S, Shokunbi WA, Sodeinde O, Doumbo O, Fernandez-Reyes D, Dessein AJ. A Functional IL22 Polymorphism (rs2227473) Is Associated with Predisposition to Childhood Cerebral Malaria. Sci Rep 2017; 7:41636. [PMID: 28139719 PMCID: PMC5282577 DOI: 10.1038/srep41636] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 12/21/2016] [Indexed: 02/07/2023] Open
Abstract
Cerebral malaria (CM) is a severe complication of Plasmodium falciparum infection. This encephalopathy is characterized by coma and is thought to result from mechanical microvessel obstruction and an excessive activation of immune cells leading to pathological inflammation and blood-brain barrier alterations. IL-22 contributes to both chronic inflammatory and infectious diseases, and may have protective or pathogenic effects, depending on the tissue and disease state. We evaluated whether polymorphisms (n = 46) of IL22 and IL22RA2 were associated with CM in children from Nigeria and Mali. Two SNPs of IL22, rs1012356 (P = 0.016, OR = 2.12) and rs2227476 (P = 0.007, OR = 2.08) were independently associated with CM in a sample of 115 Nigerian children with CM and 160 controls. The association with rs2227476 (P = 0.01) was replicated in 240 nuclear families with one affected child from Mali. SNP rs2227473, in linkage disequilibrium with rs2227476, was also associated with CM in the combined cohort for these two populations, (P = 0.004, OR = 1.55). SNP rs2227473 is located within a putative binding site for the aryl hydrocarbon receptor, a master regulator of IL-22 production. Individuals carrying the aggravating T allele of rs2227473 produced significantly more IL-22 than those without this allele. Overall, these findings suggest that IL-22 is involved in the pathogenesis of CM.
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Affiliation(s)
- Sandrine Marquet
- Aix-Marseille University, INSERM, GIMP, Labex ParaFrap, Marseille, France
| | - Ianina Conte
- Department of Computer Science, Faculty of Engineering Sciences, University College London, Gower Street, London, WCE2 6BT, United Kingdom
| | - Belco Poudiougou
- Malaria Research and Training Center, Department of Epidemiology of Parasitic Disease, Faculty of Medicine, USTTB, BP 1805, Bamako, Mali
| | - Laurent Argiro
- Aix-Marseille University, INSERM, GIMP, Labex ParaFrap, Marseille, France
| | - Hélia Dessein
- Aix-Marseille University, INSERM, GIMP, Labex ParaFrap, Marseille, France
| | - Charlène Couturier
- Aix-Marseille University, INSERM, GIMP, Labex ParaFrap, Marseille, France
| | - Florence Burté
- Department of Computer Science, Faculty of Engineering Sciences, University College London, Gower Street, London, WCE2 6BT, United Kingdom
| | - Aboubacar A. Oumar
- Centre des Oeuvres Universitaires, University of Bamako, BP 1805, Bamako, Mali
| | - Biobele J. Brown
- Department of Pediatrics, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
- Department of Hematology, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
- Childhood Malaria Research Group, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
| | - Abdoualye Traore
- Malaria Research and Training Center, Department of Epidemiology of Parasitic Disease, Faculty of Medicine, USTTB, BP 1805, Bamako, Mali
| | - Nathaniel K. Afolabi
- Department of Pediatrics, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
| | | | - Samuel Omokhodion
- Department of Pediatrics, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
- Childhood Malaria Research Group, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
| | - Wuraola A. Shokunbi
- Department of Hematology, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
- Childhood Malaria Research Group, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
| | - Olugbemiro Sodeinde
- Department of Computer Science, Faculty of Engineering Sciences, University College London, Gower Street, London, WCE2 6BT, United Kingdom
- Department of Pediatrics, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
- Department of Hematology, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
- Childhood Malaria Research Group, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
| | - Ogobara Doumbo
- Malaria Research and Training Center, Department of Epidemiology of Parasitic Disease, Faculty of Medicine, USTTB, BP 1805, Bamako, Mali
| | - Delmiro Fernandez-Reyes
- Department of Computer Science, Faculty of Engineering Sciences, University College London, Gower Street, London, WCE2 6BT, United Kingdom
- Department of Pediatrics, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
- Department of Hematology, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
- Childhood Malaria Research Group, College of Medicine, University of Ibadan, University College Hospital, Ibadan, Nigeria
| | - Alain J. Dessein
- Aix-Marseille University, INSERM, GIMP, Labex ParaFrap, Marseille, France
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27
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Hart GT, Akkaya M, Chida AS, Wei C, Jenks SA, Tipton C, He C, Wendel BS, Skinner J, Arora G, Kayentao K, Ongoiba A, Doumbo O, Traore B, Narum DL, Jiang N, Crompton PD, Sanz I, Pierce SK. The Regulation of Inherently Autoreactive VH4-34-Expressing B Cells in Individuals Living in a Malaria-Endemic Area of West Africa. J Immunol 2016; 197:3841-3849. [PMID: 27798155 DOI: 10.4049/jimmunol.1600491] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 09/21/2016] [Indexed: 11/19/2022]
Abstract
Plasmodium falciparum malaria is a deadly infectious disease in which Abs play a critical role in naturally acquired immunity. However, the specificity and nature of Abs elicited in response to malaria are only partially understood. Autoreactivity and polyreactivity are common features of Ab responses in several infections and were suggested to contribute to effective pathogen-specific Ab responses. In this article, we report on the regulation of B cells expressing the inherently autoreactive VH4-34 H chain (identified by the 9G4 mAb) and 9G4+ plasma IgG in adults and children living in a P. falciparum malaria-endemic area in West Africa. The frequency of 9G4+ peripheral blood CD19+ B cells was similar in United States adults and African adults and children; however, more 9G4+ B cells appeared in classical and atypical memory B cell compartments in African children and adults compared with United States adults. The levels of 9G4+ IgG increased following acute febrile malaria but did not increase with age as humoral immunity is acquired or correlate with protection from acute disease. This was the case, even though a portion of 9G4+ B cells acquired phenotypes of atypical and classical memory B cells and 9G4+ IgG contained equivalent numbers of somatic hypermutations compared with all other VHs, a characteristic of secondary Ab repertoire diversification in response to Ag stimulation. Determining the origin and function of 9G4+ B cells and 9G4+ IgG in malaria may contribute to a better understanding of the varied roles of autoreactivity in infectious diseases.
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Affiliation(s)
- Geoffrey T Hart
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852
| | - Munir Akkaya
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852
| | - Asiya S Chida
- Division of Rheumatology, Department of Medicine, Lowance Center for Human Immunology, Emory University, Atlanta, GA 30322
| | - Chungwen Wei
- Division of Rheumatology, Department of Medicine, Lowance Center for Human Immunology, Emory University, Atlanta, GA 30322
| | - Scott A Jenks
- Division of Rheumatology, Department of Medicine, Lowance Center for Human Immunology, Emory University, Atlanta, GA 30322
| | | | - Chenfeng He
- Department of Biomedical Engineering, Cockrell School of Engineering, University of Texas at Austin, Austin, TX 78712
| | - Ben S Wendel
- McKetta Department of Chemical Engineering, Cockrell School of Engineering, University of Texas at Austin, Austin, TX 78712
| | - Jeff Skinner
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852
| | - Gunjan Arora
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852
| | - Kassoum Kayentao
- Malaria Research and Training Centre, Department of Epidemiology of Parasitic Diseases, International Center of Excellence in Research, University of Sciences, Technique, and Technology of Bamako, Bamako, Mali; and
| | - Aissata Ongoiba
- Malaria Research and Training Centre, Department of Epidemiology of Parasitic Diseases, International Center of Excellence in Research, University of Sciences, Technique, and Technology of Bamako, Bamako, Mali; and
| | - Ogobara Doumbo
- Malaria Research and Training Centre, Department of Epidemiology of Parasitic Diseases, International Center of Excellence in Research, University of Sciences, Technique, and Technology of Bamako, Bamako, Mali; and
| | - Boubacar Traore
- Malaria Research and Training Centre, Department of Epidemiology of Parasitic Diseases, International Center of Excellence in Research, University of Sciences, Technique, and Technology of Bamako, Bamako, Mali; and
| | - David L Narum
- Laboratory of Malaria Immunology and Vaccinology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852
| | - Ning Jiang
- Department of Biomedical Engineering, Cockrell School of Engineering, University of Texas at Austin, Austin, TX 78712
| | - Peter D Crompton
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852
| | - Ignacio Sanz
- Division of Rheumatology, Department of Medicine, Lowance Center for Human Immunology, Emory University, Atlanta, GA 30322
| | - Susan K Pierce
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852;
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Dicko A, Dicko Y, Barry A, Sidibe Y, Mahamar A, Santara G, Dolo A, Diallo A, Doumbo O, Shafi F, François N, Yarzabal JP, Strezova A, Borys D, Schuerman L. Safety, reactogenicity and immunogenicity of 2-dose catch-up vaccination with 10-valent pneumococcal non-typeable Haemophilus influenzae protein D conjugate vaccine (PHiD-CV) in Malian children in the second year of life: Results from an open study. Hum Vaccin Immunother 2016; 11:2207-14. [PMID: 26020101 PMCID: PMC4635909 DOI: 10.1080/21645515.2015.1016679] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Pneumonia is still the leading cause of death among African children with pneumococcal serotypes 1 and 5 being dominant in the below 5 y of age group. The present study assessed the safety, reactogenicity and immunogenicity of a 2-dose catch-up vaccination with the 10-valent pneumococcal non-typeable Haemophilus influenzae Protein D conjugate vaccine (PHiD-CV) in Malian children. This phase III, open-label study (NCT00985465) was conducted in Ouelessebougou, Mali, between November 2009 and July 2010. The study population consisted of PHiD-CV unprimed Malian children previously enrolled in the control group of study NCT00678301 receiving a 2-dose catch-up vaccination with PHiD-CV in the second year of life. Adverse events were recorded following each PHiD-CV dose. Antibody responses and opsonophagocytic activity (OPA) were measured pre-vaccination and after the second PHiD-CV catch-up dose. Swelling and fever (axillary temperature ≥ 37.5°C) were the most frequently reported solicited symptoms following either PHiD-CV dose. Few grade 3 solicited symptoms were reported. Large swelling reactions and serious adverse events were not reported. Post-catch-up vaccination, for each vaccine pneumococcal serotype, at least 94.7% of subjects had antibody concentrations ≥ 0.2 μg/ml, except for serotypes 6B (82.5%) and 23F (87.7%). At least 94.0% of subjects had OPA titres ≥ 8, except for serotype 19F (89.4%). The geometric mean concentration for antibodies against protein D was 839.3 (95% CI: 643.5-1094.6) EL.U/ml. Two-dose PHiD-CV catch-up regimen in the second year of life was well-tolerated and immunogenic for all vaccine pneumococcal serotypes and NTHi protein D when administered to Malian children
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Key Words
- 22F-ELISA, 22F-inhibition enzyme-linked immunosorbent assay
- 7vCRM, 7-valent pneumococcal CRM197 conjugate vaccine
- AE, adverse event
- ATP, according-to-protocol
- CI, confidence interval
- DTPw-HBV/Hib, diphtheria-tetanus-whole-cell pertussis, hepatitis B virus/Haemophilus influenzae type b vaccine
- EL.U, ELISA unit
- GAVI, Global Alliance for Vaccines and Immunization
- GMC, geometric mean concentration
- GMT, geometric mean titer
- IPD, invasive pneumococcal disease
- IgG, immunoglobulin G
- LAR, legally acceptable representative
- Mali
- NTHi, non-typeable Haemophilus influenzae
- OPA, opsonophagocytic activity
- OPV, oral live attenuated poliovirus vaccine
- PCV, pneumococcal conjugate vaccine
- PHiD-CV
- PHiD-CV, pneumococcal non-typeable Haemophilus influenzae (NTHi) protein D conjugate vaccine
- SAE, serious adverse event
- SD, standard deviation
- catch-up vaccination
- immunogenicity
- pneumococcal conjugate vaccine
- reactogenicity
- safety
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Affiliation(s)
- Alassane Dicko
- a Malaria Research and Training Center; Faculty of Medicine; Pharmacy and Dentistry; University of Bamako ; Bamako , Mali
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Traoré K, Arama C, Médebielle M, Doumbo O, Picot S. Do advanced glycation end-products play a role in malaria susceptibility? ACTA ACUST UNITED AC 2016; 23:15. [PMID: 27012162 PMCID: PMC4807375 DOI: 10.1051/parasite/2016015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 03/10/2016] [Indexed: 12/30/2022]
Abstract
There are growing data supporting the differences in susceptibility to malaria described between sympatric populations with different lifestyles. Evidence has also been growing for some time that nutritional status and the host's metabolism are part of the complex mechanisms underlying these differences. The role of dietary advanced glycation end-products (AGEs) in the modulation of immune responses (innate and adaptive responses) and chronic oxidative stress has been established. But less is known about AGE implication in naturally acquired immunity and susceptibility to malaria. Since inflammatory immune responses and oxidative events have been demonstrated as the hallmark of malaria infection, it seems crucial to investigate the role of AGE in susceptibility or resistance to malaria. This review provides new insight into the relationship between nutrition, metabolic disorders, and infections, and how this may influence the mechanisms of susceptibility or resistance to malaria in endemic areas.
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Affiliation(s)
- Karim Traoré
- Malaria Research and Training Center MRTC-DEAP-FMPOS-UMI 3189, Université des Sciences, des Techniques et des Technologies de Bamako, BP 1805, Bamako, Mali - Univ Lyon, Université Claude Bernard Lyon 1, Institut de Chimie, de Biologie Moléculaire et Supramoléculaire ICBMS-UMR5246, CNRS-INSA-CPE, Malaria Research Unit, - 43 boulevard du 11 novembre 1918, 69622 Lyon, France
| | - Charles Arama
- Malaria Research and Training Center MRTC-DEAP-FMPOS-UMI 3189, Université des Sciences, des Techniques et des Technologies de Bamako, BP 1805, Bamako, Mali
| | - Maurice Médebielle
- Univ Lyon, Université Claude Bernard Lyon 1, Institut de Chimie, de Biologie Moléculaire et Supramoléculaire ICBMS-UMR5246, CNRS-INSA-CPE, - 43 boulevard du 11 novembre 1918, 69622 Lyon, France
| | - Ogobara Doumbo
- Malaria Research and Training Center MRTC-DEAP-FMPOS-UMI 3189, Université des Sciences, des Techniques et des Technologies de Bamako, BP 1805, Bamako, Mali
| | - Stéphane Picot
- Univ Lyon, Université Claude Bernard Lyon 1, Institut de Chimie, de Biologie Moléculaire et Supramoléculaire ICBMS-UMR5246, CNRS-INSA-CPE, Malaria Research Unit, - 43 boulevard du 11 novembre 1918, 69622 Lyon, France
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Niare S, Berenger JM, Dieme C, Doumbo O, Raoult D, Parola P, Almeras L. Identification of blood meal sources in the main African malaria mosquito vector by MALDI-TOF MS. Malar J 2016; 15:87. [PMID: 26872451 PMCID: PMC4752743 DOI: 10.1186/s12936-016-1152-6] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 02/05/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The identification of blood meal sources in malaria vectors is critical to better understanding host/vector interactions and malaria epidemiology and control. Currently, the identification of mosquito blood meal origins is based on time-consuming and costly techniques such as precipitin tests, ELISA and molecular tools. Although these tools have been validated to identify the blood meal and trophic preferences of female Anopheles mosquitoes, they present several limitations. Recently, matrix-assisted, laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) was successfully used as a quick and accurate tool for arthropod identification, including mosquitoes. The aim of the present work was to test whether MALDI-TOF MS could also be applied to identification of blood meal sources from engorged mosquitoes. METHODS Abdomen proteins extracted from Anopheles gambiae (stricto sensu, S molecular form) that were either unengorged or artificially engorged on seven distinct types of vertebrate blood (human, horse, sheep, rabbit, mouse, rat, dog) were submitted for MALDI-TOF MS. RESULTS The comparison of mass spectrometry (MS) spectra from mosquito abdomens collected 1 h post-feeding, were able to discriminate blood meal origins. Moreover, using Aedes albopictus specimens, abdominal protein MS spectra from engorged mosquitoes were found specific to host blood source and independent of the mosquito species. A sequential analysis revealed stability of mosquito abdominal protein spectra up to 24 h post-feeding. CONCLUSIONS These results indicate that MALDI-TOF MS could determine feeding patterns of freshly engorged mosquitoes up to 24 h post-blood meal. The MALDI-TOF MS technique appears to be an efficient tool for large epidemiological surveillance of vector-borne diseases and outbreak source identification.
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Affiliation(s)
- Sirama Niare
- Unité de Recherche en Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63, CNRS 7278, IRD 198 (Dakar, Sénégal), Inserm 1095, Faculté de Médecine, Aix Marseille Université, 27 bd Jean Moulin, 13385, Marseille cedex 5, France. .,Malaria Research and Training Center, DEAP/FMOS, UMI 3189, University of Science, Techniques and Technology, Bamako, Mali.
| | - Jean-Michel Berenger
- Unité de Recherche en Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63, CNRS 7278, IRD 198 (Dakar, Sénégal), Inserm 1095, Faculté de Médecine, Aix Marseille Université, 27 bd Jean Moulin, 13385, Marseille cedex 5, France.
| | - Constentin Dieme
- Unité de Recherche en Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63, CNRS 7278, IRD 198 (Dakar, Sénégal), Inserm 1095, Faculté de Médecine, Aix Marseille Université, 27 bd Jean Moulin, 13385, Marseille cedex 5, France.
| | - Ogobara Doumbo
- Malaria Research and Training Center, DEAP/FMOS, UMI 3189, University of Science, Techniques and Technology, Bamako, Mali.
| | - Didier Raoult
- Unité de Recherche en Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63, CNRS 7278, IRD 198 (Dakar, Sénégal), Inserm 1095, Faculté de Médecine, Aix Marseille Université, 27 bd Jean Moulin, 13385, Marseille cedex 5, France.
| | - Philippe Parola
- Unité de Recherche en Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63, CNRS 7278, IRD 198 (Dakar, Sénégal), Inserm 1095, Faculté de Médecine, Aix Marseille Université, 27 bd Jean Moulin, 13385, Marseille cedex 5, France.
| | - Lionel Almeras
- Unité de Recherche en Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63, CNRS 7278, IRD 198 (Dakar, Sénégal), Inserm 1095, Faculté de Médecine, Aix Marseille Université, 27 bd Jean Moulin, 13385, Marseille cedex 5, France.
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Williams J, Njie F, Cairns M, Bojang K, Coulibaly SO, Kayentao K, Abubakar I, Akor F, Mohammed K, Bationo R, Dabira E, Soulama A, Djimdé M, Guirou E, Awine T, Quaye SL, Ordi J, Doumbo O, Hodgson A, Oduro A, Magnussen P, Ter Kuile FO, Woukeu A, Milligan P, Tagbor H, Greenwood B, Chandramohan D. Non-falciparum malaria infections in pregnant women in West Africa. Malar J 2016; 15:53. [PMID: 26823277 PMCID: PMC4731909 DOI: 10.1186/s12936-016-1092-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 01/10/2016] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Non-Plasmodium falciparum malaria infections are found in many parts of sub-Saharan Africa but little is known about their importance in pregnancy. METHODS Blood samples were collected at first antenatal clinic attendance from 2526 women enrolled in a trial of intermittent screening and treatment of malaria in pregnancy (ISTp) versus intermittent preventive treatment (IPTp) conducted in Burkina Faso, The Gambia, Ghana and Mali. DNA was extracted from blood spots and tested for P. falciparum, Plasmodium vivax, Plasmodium malariae and Plasmodium ovale using a nested PCR test. Risk factors for a non-falciparum malaria infection were investigated and the influence of these infections on the outcome of pregnancy was determined. RESULTS P. falciparum infection was detected frequently (overall prevalence by PCR: 38.8 %, [95 % CI 37.0, 40.8]), with a prevalence ranging from 10.8 % in The Gambia to 56.1 % in Ghana. Non-falciparum malaria infections were found only rarely (overall prevalence 1.39 % [95 % CI 1.00, 1.92]), ranging from 0.17 % in the Gambia to 3.81 % in Mali. Ten non-falciparum mono-infections and 25 mixed falciparum and non-falciparum infections were found. P. malariae was the most frequent non-falciparum infection identified; P. vivax was detected only in Mali. Only four of the non-falciparum mono-infections were detected by microscopy or rapid diagnostic test. Recruitment during the late rainy season and low socio-economic status were associated with an increased risk of non-falciparum malaria as well as falciparum malaria. The outcome of pregnancy did not differ between women with a non-falciparum malaria infection and those who were not infected with malaria at first ANC attendance. CONCLUSIONS Non-falciparum infections were infrequent in the populations studied, rarely detected when present as a mono-infection and unlikely to have had an important impact on the outcome of pregnancy in the communities studied due to the small number of women infected with non-falciparum parasites.
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Affiliation(s)
| | - Fanta Njie
- Medical Research Council Unit, Fajara, Gambia.
| | - Matthew Cairns
- London School of Hygiene and Tropical Medicine, Keppel St., London, WC1E 7HT, UK.
| | | | | | - Kassoum Kayentao
- Malaria Research and Training Centre, Faculty of Medicine and Odonto-Stomatology, University of Sciences, Techniques and Technologies, Bamako, Mali.
| | - Ismaela Abubakar
- London School of Hygiene and Tropical Medicine, Keppel St., London, WC1E 7HT, UK.
| | | | | | - Richard Bationo
- Faculty of Health Sciences, University of Ouagadougou, Ouagadougou, Burkina Faso.
| | - Edgar Dabira
- Faculty of Health Sciences, University of Ouagadougou, Ouagadougou, Burkina Faso.
| | - Alamissa Soulama
- Faculty of Health Sciences, University of Ouagadougou, Ouagadougou, Burkina Faso.
| | - Moussa Djimdé
- Malaria Research and Training Centre, Faculty of Medicine and Odonto-Stomatology, University of Sciences, Techniques and Technologies, Bamako, Mali.
| | - Etienne Guirou
- Malaria Research and Training Centre, Faculty of Medicine and Odonto-Stomatology, University of Sciences, Techniques and Technologies, Bamako, Mali.
| | | | | | - Jaume Ordi
- JSGlobal, Barcelona Centre for International Health Research (CRESIB), Department of Pathology, Hospital Clinic-Universitat de Barcelona, Barcelona, Spain.
| | - Ogobara Doumbo
- Malaria Research and Training Centre, Faculty of Medicine and Odonto-Stomatology, University of Sciences, Techniques and Technologies, Bamako, Mali.
| | | | | | - Pascal Magnussen
- Institute of International Health, Immunology and Microbiology, Centre for Medical Parasitology and Institute of Veterinary Disease Biology, University of Copenhagen, Copenhagen, Denmark.
| | | | - Arouna Woukeu
- London School of Hygiene and Tropical Medicine, Keppel St., London, WC1E 7HT, UK.
| | - Paul Milligan
- London School of Hygiene and Tropical Medicine, Keppel St., London, WC1E 7HT, UK.
| | - Harry Tagbor
- School of Public Health, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
| | - Brian Greenwood
- London School of Hygiene and Tropical Medicine, Keppel St., London, WC1E 7HT, UK.
| | - Daniel Chandramohan
- London School of Hygiene and Tropical Medicine, Keppel St., London, WC1E 7HT, UK.
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Cherif M, Amoako-Sakyi D, Dolo A, Pearson JO, Gyan B, Obiri-Yeboah D, Nebie I, Sirima SB, Doumbo O, Troye-Blomberg M, Bakary M. Distribution of FcγR gene polymorphisms among two sympatric populations in Mali: differing allele frequencies, associations with malariometric indices and implications for genetic susceptibility to malaria. Malar J 2016; 15:29. [PMID: 26785902 PMCID: PMC4717667 DOI: 10.1186/s12936-015-1082-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 12/31/2015] [Indexed: 11/18/2022] Open
Abstract
Background Genetic polymorphisms in the complex gene cluster encoding human Fc-gamma receptors (FcγRs) may influence malaria susceptibility and pathogenesis. Studying genetic susceptibility to malaria is ideal among sympatric populations because the distribution of polymorphic genes among such populations can help in the identification malaria candidate genes. This study determined the distribution of three FcyRs single nucleotide polymorphisms (SNPs) (FcγRIIB-rs1050519, FcγRIIC-rs3933769 and FcγRIIIA-rs396991) among sympatric Fulani and Dogon children with uncomplicated malaria. The association of these SNPs with clinical, malariometric and immunological indices was also tested. Methods This study involved 242 Fulani and Dogon volunteers from Mali age under 15 years. All SNPs were genotyped with predesigned TaqMan® SNP Genotyping Assays. Genotypic and allelic distribution of SNPs was compared across ethnic groups using the Fisher exact test. Variations in clinical, malariometric and immunologic indices between groups were tested with Kruskal–Wallis H, Mann–Whitney U test and Fisher exact test where appropriate. Results The study confirmed known malariometric and immunologic differences between sympatric Fulani and non-Fulani tribes. Parasite density was lower in the Fulani than the Dogon (p < 0.0001). The mutant allele of FcγRIIC (rs3933769) was found more frequently in the Fulani than the Dogon (p < 0.0001) while that of FcγRIIIA (rs396991) occurred less frequently in the Fulani than Dogon (p = 0.0043). The difference in the mutant allele frequency of FcγRIIB (rs1050519) between the two ethnic groups was however not statistically significant (p = 0.064). The mutant allele of rs396991 was associated with high malaria-specific IgG1 and IgG3 in the entire study population and Dogon tribe, p = 0.023 and 0.015, respectively. Parasite burden was lower in carriers of the FcγRIIC (rs3933769) mutant allele than non-carriers in the entire study population (p < 0.0001). Carriers of this allele harboured less than half the parasites found in non-carriers. Conclusion Differences in the allelic frequencies of rs3933769 and rs396991 among Fulani and Dogon indirectly suggest that these SNPs may influence malaria susceptibility and pathogenesis in the study population. The high frequency of the FcγRIIC (rs3933769) mutant allele in the Fulani and its subsequent association with low parasite burden in the entire study population is noteworthy.
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Affiliation(s)
- Mariama Cherif
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso. .,Polytechnic University of Bobo Dioulasso, Bobo Dioulasso, Burkina Faso.
| | - Daniel Amoako-Sakyi
- Department of Microbiology and Immunology, College of Health and Allied Sciences, School of Medical Sciences, University of Cape Coast, Cape Coast, Ghana. .,Immunology Department, Noguchi Memorial Institute for Medical Research, University of Ghana, Legon, Accra, Ghana.
| | - Amagana Dolo
- Department of Epidemiology of Parasitic Diseases, Faculty of Medicine and Odonto-Stomatology, Malaria Research and Training Centre, USTTB, Bamako, Mali.
| | - Jan-Olov Pearson
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden.
| | - Ben Gyan
- Immunology Department, Noguchi Memorial Institute for Medical Research, University of Ghana, Legon, Accra, Ghana.
| | - Dorcas Obiri-Yeboah
- Department of Microbiology and Immunology, College of Health and Allied Sciences, School of Medical Sciences, University of Cape Coast, Cape Coast, Ghana.
| | - Issa Nebie
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso.
| | - Sodiomon B Sirima
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso.
| | - Ogobara Doumbo
- Department of Epidemiology of Parasitic Diseases, Faculty of Medicine and Odonto-Stomatology, Malaria Research and Training Centre, USTTB, Bamako, Mali.
| | - Marita Troye-Blomberg
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden.
| | - Maiga Bakary
- Department of Epidemiology of Parasitic Diseases, Faculty of Medicine and Odonto-Stomatology, Malaria Research and Training Centre, USTTB, Bamako, Mali.
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Desai M, Gutman J, Taylor SM, Wiegand RE, Khairallah C, Kayentao K, Ouma P, Coulibaly SO, Kalilani L, Mace KE, Arinaitwe E, Mathanga DP, Doumbo O, Otieno K, Edgar D, Chaluluka E, Kamuliwo M, Ades V, Skarbinski J, Shi YP, Magnussen P, Meshnick S, Ter Kuile FO. Impact of Sulfadoxine-Pyrimethamine Resistance on Effectiveness of Intermittent Preventive Therapy for Malaria in Pregnancy at Clearing Infections and Preventing Low Birth Weight. Clin Infect Dis 2015; 62:323-333. [PMID: 26486699 DOI: 10.1093/cid/civ881] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 10/03/2015] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Owing to increasing sulfadoxine-pyrimethamine (SP) resistance in sub-Saharan Africa, monitoring the effectiveness of intermittent preventive therapy in pregnancy (IPTp) with SP is crucial. METHODS Between 2009 and 2013, both the efficacy of IPTp-SP at clearing existing peripheral malaria infections and the effectiveness of IPTp-SP at reducing low birth weight (LBW) were assessed among human immunodeficiency virus-uninfected participants in 8 sites in 6 countries. Sites were classified as high, medium, or low resistance after measuring parasite mutations conferring SP resistance. An individual-level prospective pooled analysis was conducted. RESULTS Among 1222 parasitemic pregnant women, overall polymerase chain reaction-uncorrected and -corrected failure rates by day 42 were 21.3% and 10.0%, respectively (39.7% and 21.1% in high-resistance areas; 4.9% and 1.1% in low-resistance areas). Median time to recurrence decreased with increasing prevalence of Pfdhps-K540E. Among 6099 women at delivery, IPTp-SP was associated with a 22% reduction in the risk of LBW (prevalence ratio [PR], 0.78; 95% confidence interval [CI], .69-.88; P < .001). This association was not modified by insecticide-treated net use or gravidity, and remained significant in areas with high SP resistance (PR, 0.81; 95% CI, .67-.97; P = .02). CONCLUSIONS The efficacy of SP to clear peripheral parasites and prevent new infections during pregnancy is compromised in areas with >90% prevalence of Pfdhps-K540E. Nevertheless, in these high-resistance areas, IPTp-SP use remains associated with increases in birth weight and maternal hemoglobin. The effectiveness of IPTp in eastern and southern Africa is threatened by further increases in SP resistance and reinforces the need to evaluate alternative drugs and strategies for the control of malaria in pregnancy.
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Affiliation(s)
- Meghna Desai
- Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia.,Malaria Branch, Center for Global Health Research, Kenya Medical Research Institute, Kisumu
| | - Julie Gutman
- Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Steve M Taylor
- Division of Infectious Diseases and International Health, Duke University Medical Center, Durham, North Carolina.,Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill
| | - Ryan E Wiegand
- Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Carole Khairallah
- Department of Clinical Sciences, Liverpool School of Tropical Medicine, United Kingdom
| | - Kassoum Kayentao
- Department of Clinical Sciences, Liverpool School of Tropical Medicine, United Kingdom.,Malaria Research and Training Center, University of Sciences, Technics and Technologies of Bamako, Mali
| | - Peter Ouma
- Malaria Branch, Center for Global Health Research, Kenya Medical Research Institute, Kisumu
| | | | | | - Kimberly E Mace
- Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia
| | | | | | - Ogobara Doumbo
- Malaria Research and Training Center, University of Sciences, Technics and Technologies of Bamako, Mali
| | - Kephas Otieno
- Malaria Branch, Center for Global Health Research, Kenya Medical Research Institute, Kisumu
| | | | | | | | - Veronica Ades
- New York University Langone Medical Center, New York
| | - Jacek Skarbinski
- Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Ya Ping Shi
- Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Pascal Magnussen
- Centre for Medical Parasitology, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Steve Meshnick
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill
| | - Feiko O Ter Kuile
- Department of Clinical Sciences, Liverpool School of Tropical Medicine, United Kingdom
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Tagbor H, Cairns M, Bojang K, Coulibaly SO, Kayentao K, Williams J, Abubakar I, Akor F, Mohammed K, Bationo R, Dabira E, Soulama A, Djimdé M, Guirou E, Awine T, Quaye S, Njie F, Ordi J, Doumbo O, Hodgson A, Oduro A, Meshnick S, Taylor S, Magnussen P, ter Kuile F, Woukeu A, Milligan P, Chandramohan D, Greenwood B. A Non-Inferiority, Individually Randomized Trial of Intermittent Screening and Treatment versus Intermittent Preventive Treatment in the Control of Malaria in Pregnancy. PLoS One 2015; 10:e0132247. [PMID: 26258474 PMCID: PMC4530893 DOI: 10.1371/journal.pone.0132247] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 06/10/2015] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND The efficacy of intermittent preventive treatment for malaria with sulfadoxine-pyrimethamine (IPTp-SP) in pregnancy is threatened in parts of Africa by the emergence and spread of resistance to SP. Intermittent screening with a rapid diagnostic test (RDT) and treatment of positive women (ISTp) is an alternative approach. METHODS AND FINDINGS An open, individually randomized, non-inferiority trial of IPTp-SP versus ISTp was conducted in 5,354 primi- or secundigravidae in four West African countries with a low prevalence of resistance to SP (The Gambia, Mali, Burkina Faso and Ghana). Women in the IPTp-SP group received SP on two or three occasions whilst women in the ISTp group were screened two or three times with a RDT and treated if positive for malaria with artemether-lumefantrine (AL). ISTp-AL was non-inferior to IPTp-SP in preventing low birth weight (LBW), anemia and placental malaria, the primary trial endpoints. The prevalence of LBW was 15.1% and 15.6% in the IPTp-SP and ISTp-AL groups respectively (OR = 1.03 [95% CI: 0.88, 1.22]). The mean hemoglobin concentration at the last clinic attendance before delivery was 10.97g/dL and 10.94g/dL in the IPTp-SP and ISTp-AL groups respectively (mean difference: -0.03 g/dL [95% CI: -0.13, +0.06]). Active malaria infection of the placenta was found in 24.5% and in 24.2% of women in the IPTp-SP and ISTp-AL groups respectively (OR = 0.95 [95% CI 0.81, 1.12]). More women in the ISTp-AL than in the IPTp-SP group presented with malaria parasitemia between routine antenatal clinics (310 vs 182 episodes, rate difference: 49.4 per 1,000 pregnancies [95% CI 30.5, 68.3], but the number of hospital admissions for malaria was similar in the two groups. CONCLUSIONS Despite low levels of resistance to SP in the study areas, ISTp-AL performed as well as IPTp-SP. In the absence of an effective alternative medication to SP for IPTp, ISTp-AL is a potential alternative to IPTp in areas where SP resistance is high. It may also have a role in areas where malaria transmission is low and for the prevention of malaria in HIV positive women receiving cotrimoxazole prophylaxis in whom SP is contraindicated. TRIAL REGISTRATION ClinicalTrials.gov NCT01084213 Pan African Clinical trials Registry PACT201202000272122.
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Affiliation(s)
- Harry Tagbor
- London School of Hygiene & Tropical Medicine, London, United Kingdom
- School of Public Health, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Matthew Cairns
- London School of Hygiene & Tropical Medicine, London, United Kingdom
| | | | | | - Kassoum Kayentao
- Malaria Research and Training Centre, Faculty of Medicine and Odonto-stomatology, University of Sciences, Technics and Technologies, Bamako, Mali
| | | | | | - Francis Akor
- Medical Research Council Unit, Fajara, The Gambia
| | | | - Richard Bationo
- Faculty of Health Sciences, University of Ouagadougou, Ouagadougou, Burkina Faso
| | - Edgar Dabira
- Faculty of Health Sciences, University of Ouagadougou, Ouagadougou, Burkina Faso
| | - Alamissa Soulama
- Faculty of Health Sciences, University of Ouagadougou, Ouagadougou, Burkina Faso
| | - Moussa Djimdé
- Malaria Research and Training Centre, Faculty of Medicine and Odonto-stomatology, University of Sciences, Technics and Technologies, Bamako, Mali
| | - Etienne Guirou
- Malaria Research and Training Centre, Faculty of Medicine and Odonto-stomatology, University of Sciences, Technics and Technologies, Bamako, Mali
| | | | | | - Fanta Njie
- Medical Research Council Unit, Fajara, The Gambia
| | - Jaume Ordi
- Barcelona Centre for International Health Research (CRESIB), Department of Pathology, Hospital Clinic-Universitat de Barcelona, Barcelona, Spain
| | - Ogobara Doumbo
- Malaria Research and Training Centre, Faculty of Medicine and Odonto-stomatology, University of Sciences, Technics and Technologies, Bamako, Mali
| | | | | | - Steven Meshnick
- Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC, United States of America
| | - Steve Taylor
- Duke University Medical Center, Durham, NC, United States of America
| | - Pascal Magnussen
- (Institute of International Health, Immunology and Microbiology and Institute of Veterinary Disease Biology, University of Copenhagen, Copenhagen, Denmark
| | - Feiko ter Kuile
- Liverpool School of Tropical Medicine, Liverpool, United Kingdom
| | - Arouna Woukeu
- London School of Hygiene & Tropical Medicine, London, United Kingdom
| | - Paul Milligan
- London School of Hygiene & Tropical Medicine, London, United Kingdom
| | | | - Brian Greenwood
- London School of Hygiene & Tropical Medicine, London, United Kingdom
- * E-mail:
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Traore K, Lavoignat A, Bonnot G, Sow F, Bess GC, Chavant M, Gay F, Doumbo O, Picot S. Drying anti-malarial drugs in vitro tests to outsource SYBR green assays. Malar J 2015; 14:90. [PMID: 25880553 PMCID: PMC4339011 DOI: 10.1186/s12936-015-0600-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 01/30/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Measurement of anti-malarial drug efficacy and resistance relies mainly on in vivo clinical trials, in vitro/ex vivo assays and molecular markers detection. The existing in vitro/ex vivo assays, in particular those that are using non-radioactive devices, need to be standardized and adapted to field conditions. SYBR Green assay offers a rapid and cheap alternative to other in vitro assays, but it requires tools not commonly available in field laboratories. Here is described a modified SYBR green I protocol to perform the parasite growth test with blood samples in endemic areas, followed later by the SYBR green fluorescence assay performed at a specialized laboratory level. METHODS In vitro susceptibility of Plasmodium falciparum clones HB3, 3D7, W2 and 7G8 to chloroquine (CQ), dihydroartemisinin (DHA), pyronaridine (PYD) and piperaquine (PPQ) was tested. Fresh isolates of P. falciparum from imported malaria cases were collected for ex vivo assays. The parasite suspension was added in 96-well plates predosed with anti-malarial drugs and incubated for 72 hours at 37°C, 5% CO2. SYBR green I protocol was modified to dry the plates after freeze-thawed process to mimic storage and shipping conditions. The plates were rehydrated with 200 μl of complete RPMI medium for fluorescence assay. RESULTS There were no significant differences in IC₅₀ values of CQ, DHA, PYD and PPQ, determined by the modified protocol, compared to standard protocol. Longer storage did not affect the IC₅₀ values. CONCLUSION The SYBR green I modified protocol produced reliable results and could be a suitable method for in vitro/ex vivo assays in field.
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Affiliation(s)
- Karim Traore
- Malaria Research and Training Center, DEAP/FMPOS, UMI3189, Université des Sciences, des Techniques et des Technologies de Bamako, BP 1805, Bamako, Mali. .,Malaria Research Unit, SMITH, ICBMS, UMR 5246 CNRS-INSA-CPE-University Claude Bernard Lyon1, 8 Avenue Rockefeller, 69373, Lyon, Cedex 08, France.
| | - Adeline Lavoignat
- Malaria Research Unit, SMITH, ICBMS, UMR 5246 CNRS-INSA-CPE-University Claude Bernard Lyon1, 8 Avenue Rockefeller, 69373, Lyon, Cedex 08, France.
| | - Guillaume Bonnot
- Malaria Research Unit, SMITH, ICBMS, UMR 5246 CNRS-INSA-CPE-University Claude Bernard Lyon1, 8 Avenue Rockefeller, 69373, Lyon, Cedex 08, France.
| | - Fatimata Sow
- Malaria Research Unit, SMITH, ICBMS, UMR 5246 CNRS-INSA-CPE-University Claude Bernard Lyon1, 8 Avenue Rockefeller, 69373, Lyon, Cedex 08, France.
| | - Giuliana C Bess
- Institut de Parasitologie et Mycologie Médicale, Hospices Civils de Lyon, Lyon, France.
| | - Marjorie Chavant
- Institut de Parasitologie et Mycologie Médicale, Hospices Civils de Lyon, Lyon, France.
| | - Frederick Gay
- AP-HP, Service de Parasitologie-Mycologie, Université Pierre et Marie Curie Paris 6, Paris, France.
| | - Ogobara Doumbo
- Malaria Research and Training Center, DEAP/FMPOS, UMI3189, Université des Sciences, des Techniques et des Technologies de Bamako, BP 1805, Bamako, Mali.
| | - Stephane Picot
- Malaria Research Unit, SMITH, ICBMS, UMR 5246 CNRS-INSA-CPE-University Claude Bernard Lyon1, 8 Avenue Rockefeller, 69373, Lyon, Cedex 08, France. .,Institut de Parasitologie et Mycologie Médicale, Hospices Civils de Lyon, Lyon, France.
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Dabo A, Diarra AZ, Machault V, Touré O, Niambélé DS, Kanté A, Ongoiba A, Doumbo O. Urban schistosomiasis and associated determinant factors among school children in Bamako, Mali, West Africa. Infect Dis Poverty 2015; 4:4. [PMID: 25973199 PMCID: PMC4429506 DOI: 10.1186/2049-9957-4-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Accepted: 12/25/2014] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND Schistosomiasis is classically described as a rural disease that occurs in areas with poor sanitary conditions. However, over recent decades, there has been an expansion of schistosomiasis foci towards urban areas faced with a rapid and disordered urbanization. In Bamako, Mali, the impact of environmental change on vector-borne diseases such as schistosomiasis is not well known. This study sought to identify the presence of schistosomiasis transmission hotspots in Bamako. Using this perspective, we aimed to describe the risk factors of the endemization and maintenance of schistosomiasis. MATERIALS AND METHODS A cross-sectional study was carried out in the six municipalities (communes) in Bamako. Environmental information was obtained from earth observation satellites in order to maximize ecological contrasts. Twenty-nine blocks of 200 m x 200 m were identified. We selected a school inside or nearest to each block for urine and stool samples examination. The study cohort was school children aged between eight and 15 years. The Kato-Katz technique and filtration were used for Schistosoma mansoni and S. haematobium ova research in stools and urine, respectively. The schools and snail breeding sites were georeferenced. Four malacological surveys were conducted between October 2011 and February 2012. Bivariate analysis was used to identify independent predictors of being infected with schistosomiasis. RESULTS The prevalence rate of S. haematobium was 14.7% (n = 1,761) and that of S. mansoni 1.5% (n = 1,491). Overall, the urinary form was endemic in 76.6% of schools. The infection significantly varied between the municipalities (p < 0.001). It was also more prevalent on the left side of the Niger River than the right side (17.4% vs. 9.5% respectively; p < 0.001). The vicinity to snail breeding sites (OR = 3.677; 95% IC [2.765-4.889]; p < 10 (-3) ) and parents' occupations (OR = 7.647; 95% IC [2.406-24.305]; p < 0.001) were the most important risk factors associated with S. haematobium infection exposure. Biomphalaria pfeifferi, Bulinus truncatus, and B. globosus were the intermediate hosts captured. The schistosome natural infection rates (SNIRs), which were low or nil in October and November, rose to 2.8% in January and 8.3% in February for B. pfeifferi and B. truncatus, respectively. CONCLUSION Our findings show that there is a high transmission risk for schistosomiasis in Bamako. Appropriate integrated control measures need to be introduced to control the transmission of this disease in the study area.
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Affiliation(s)
- Abdoulaye Dabo
- />Department of Epidemiology of Infectious Diseases, Faculty of Medicine, Pharmacy and Dentistry, University of Techniques and Technologies of Bamako, Box 1805, Bamako, UMI 3189 Mali
| | - Adama Z Diarra
- />Department of Epidemiology of Infectious Diseases, Faculty of Medicine, Pharmacy and Dentistry, University of Techniques and Technologies of Bamako, Box 1805, Bamako, UMI 3189 Mali
| | - Vanessa Machault
- />Unité d’entomologie médicale, Equipe 7, Maladies émergentes et moustiques, Institut de Médecine Tropicale du Service de Santé des Armées, Allée du Médecin Colonel Jamot, Parc du Pharo, BP60109, 13262 Marseille Cedex 07, France
| | - Ousmane Touré
- />Department of Epidemiology of Infectious Diseases, Faculty of Medicine, Pharmacy and Dentistry, University of Techniques and Technologies of Bamako, Box 1805, Bamako, UMI 3189 Mali
| | - Diarra Sira Niambélé
- />Department of Epidemiology of Infectious Diseases, Faculty of Medicine, Pharmacy and Dentistry, University of Techniques and Technologies of Bamako, Box 1805, Bamako, UMI 3189 Mali
| | - Abdoulaye Kanté
- />Department of Epidemiology of Infectious Diseases, Faculty of Medicine, Pharmacy and Dentistry, University of Techniques and Technologies of Bamako, Box 1805, Bamako, UMI 3189 Mali
| | - Abdoulaye Ongoiba
- />Department of Epidemiology of Infectious Diseases, Faculty of Medicine, Pharmacy and Dentistry, University of Techniques and Technologies of Bamako, Box 1805, Bamako, UMI 3189 Mali
| | - Ogobara Doumbo
- />Department of Epidemiology of Infectious Diseases, Faculty of Medicine, Pharmacy and Dentistry, University of Techniques and Technologies of Bamako, Box 1805, Bamako, UMI 3189 Mali
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Vernet G, Mary C, Altmann DM, Doumbo O, Morpeth S, Bhutta ZA, Klugman KP. Surveillance for antimicrobial drug resistance in under-resourced countries. Emerg Infect Dis 2015; 20:434-41. [PMID: 24564906 PMCID: PMC3944851 DOI: 10.3201/eid2003.121157] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
TOC summary: New programs can be improved by drawing on lessons from previous successful efforts. Antimicrobial drug resistance is usually not monitored in under-resourced countries because they lack surveillance networks, laboratory capacity, and appropriate diagnostics. This accelerating problem accounts for substantial number of excess deaths, especially among infants. Infections particularly affected by antimicrobial drug resistance include tuberculosis, malaria, severe acute respiratory infections, and sepsis caused by gram-negative bacteria. Nonetheless, mapping antimicrobial drug resistance is feasible in under-resourced countries, and lessons can be learned from previous successful efforts. Specimen shipping conditions, data standardization, absence of contamination, and adequate diagnostics must be ensured. As a first step toward solving this problem, we propose that a road map be created at the international level to strengthen antimicrobial resistance surveillance in under-resourced countries. This effort should include a research agenda; a map of existing networks and recommendations to unite them; and a communication plan for national, regional, and international organizations and funding agencies.
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Diallo M, Sangaré D, Traoré A, Mariko M, Diarra S, Diallo M, Coulibaly B, Dao A, Doumbo O, Traoré CF. [Study of the impact of breeding sites on the infectivity of P. falciparum gametocytes to An. gambiae s.l in malaria-endemic area of Nanguilabougou.-Mali]. Mali Med 2015; 30:28-33. [PMID: 29927155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Numerous studies have shown the influence of some bacteria colonizing the breeding sites on the development of the parasite in Anopheles malaria vectors. The aim of this study was to evaluate the impact of the breeding sites of Plasmodium falciparum on the gametocytes infectivity of Anopheles gambiae sl using the membrane feeding method. We carried out an experimental infestation study from September 2010 to January 2011 in a village located in the southern savanna of Mali. Cross sectional surveys were conducted to collect larvae and to select gametocyte carriers. Female offspring of L3 and L4 stage larvae were used for the experimental infestation. The gametocyte carriers were children aged within 4 to 12 years. Bacteria identified in breeding water of larvae and adult mosquitoes were: Escherichia coli, Salmonella spp, Klebsiella oxytoca, Pseudomonas spp, Staphylococcus spp, Shigella sp. The oocyst load of infected mosquitoes did not significantly vary according to the samples (F = 1.517, P = 0.230). Low infection rates (5.4% and 2.8%) were observed in the larval bedding and in mosquitoes containing K. oxytoca and Shigella. The blood feeding rates (62.4%; 60.9%; 67.7%) and mortality (66.4%; 64.9%; 61.9%) of An. gambiae did not significantly vary depending on the breeding sites [(P = 0.15); (P = 0.22)].
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Affiliation(s)
- Mouctar Diallo
- Malaria Research and Training Center (MRTC), Bamako, Mali
| | | | - Alou Traoré
- Malaria Research and Training Center (MRTC), Bamako, Mali
| | - Modibo Mariko
- Malaria Research and Training Center (MRTC), Bamako, Mali
| | - Seydou Diarra
- Institut National de Recherche en Santé Publique (INRSP), Bamako, Mali
| | - Moussa Diallo
- Malaria Research and Training Center (MRTC), Bamako, Mali
| | | | - Adama Dao
- Malaria Research and Training Center (MRTC), Bamako, Mali
| | - Ogobara Doumbo
- Malaria Research and Training Center (MRTC), Bamako, Mali
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Angelakis E, Mediannikov O, Socolovschi C, Mouffok N, Bassene H, Tall A, Niangaly H, Doumbo O, Znazen A, Sarih M, Sokhna C, Raoult D. Coxiella burnetii-positive PCR in febrile patients in rural and urban Africa. Int J Infect Dis 2014; 28:107-10. [PMID: 25245003 DOI: 10.1016/j.ijid.2014.05.029] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Revised: 05/27/2014] [Accepted: 05/30/2014] [Indexed: 10/24/2022] Open
Abstract
OBJECTIVES Q fever has been reported throughout the African continent. The objective of this study was to detect the presence of Coxiella burnetii in febrile patients from Africa. METHODS Blood samples from febrile and non-febrile patients from six African countries and from France were investigated retrospectively for Q fever infection by molecular assays targeting the IS1111 and IS30A spacers. RESULTS We tested 1888 febrile patients from Senegal, Mali, Tunisia, Algeria, Gabon, and Morocco and found one male adult patient (0.3%) infected with C. burnetii in Algeria and six positive patients (0.5%) in Senegal. For one patient from Senegal we determined that the infection was caused by C. burnetii genotype 35. In Senegal, more patients were infected with C. burnetii in Keur Momar Sarr (p=0.002) than in the other locations. Blood samples taken from 500 (51% males) non-febrile people from Senegal and France were all negative. CONCLUSIONS The installation of point-of-care laboratories in rural Africa can be a very effective tool for studying the epidemiology of many infectious diseases.
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Affiliation(s)
| | - Oleg Mediannikov
- URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, 13005 Marseille, France; Campus Commun UCAD-IRD of Hann, BP 1386, CP 18524, Dakar, Senegal
| | | | - Nadjet Mouffok
- Service des Maladies Infectieuses, Centre Hospitalo-Universitaire d'Oran, Oran, Algeria
| | - Hubert Bassene
- URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, 13005 Marseille, France; Campus Commun UCAD-IRD of Hann, BP 1386, CP 18524, Dakar, Senegal
| | - Adama Tall
- Institut Pasteur de Dakar, Dakar, Senegal
| | - Hamidou Niangaly
- Malaria Research and Training Centre, Faculty of Medicine, University of Sciences Techniques and Technology, Bamako, Bamako, Mali
| | - Ogobara Doumbo
- Malaria Research and Training Centre, Faculty of Medicine, University of Sciences Techniques and Technology, Bamako, Bamako, Mali
| | - Abir Znazen
- Laboratory of Microbiology and Laboratory of Research 'MPH', Habib Bourguiba University Hospital, Sfax, Tunisia
| | - Mhammed Sarih
- Laboratoire des Maladies Vectorielles, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Cheikh Sokhna
- URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, 13005 Marseille, France; Campus Commun UCAD-IRD of Hann, BP 1386, CP 18524, Dakar, Senegal
| | - Didier Raoult
- URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, 13005 Marseille, France; Campus Commun UCAD-IRD of Hann, BP 1386, CP 18524, Dakar, Senegal
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Doumbo S, Tran TM, Sangala J, Li S, Doumtabe D, Kone Y, Traoré A, Bathily A, Sogoba N, Coulibaly ME, Huang CY, Ongoiba A, Kayentao K, Diallo M, Dramane Z, Nutman TB, Crompton PD, Doumbo O, Traore B. Co-infection of long-term carriers of Plasmodium falciparum with Schistosoma haematobium enhances protection from febrile malaria: a prospective cohort study in Mali. PLoS Negl Trop Dis 2014; 8:e3154. [PMID: 25210876 PMCID: PMC4161351 DOI: 10.1371/journal.pntd.0003154] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2014] [Accepted: 07/31/2014] [Indexed: 01/22/2023] Open
Abstract
Background Malaria and schistosomiasis often overlap in tropical and subtropical countries and impose tremendous disease burdens; however, the extent to which schistosomiasis modifies the risk of febrile malaria remains unclear. Methods We evaluated the effect of baseline S. haematobium mono-infection, baseline P. falciparum mono-infection, and co-infection with both parasites on the risk of febrile malaria in a prospective cohort study of 616 children and adults living in Kalifabougou, Mali. Individuals with S. haematobium were treated with praziquantel within 6 weeks of enrollment. Malaria episodes were detected by weekly physical examination and self-referral for 7 months. The primary outcome was time to first or only malaria episode defined as fever (≥37.5°C) and parasitemia (≥2500 asexual parasites/µl). Secondary definitions of malaria using different parasite densities were also explored. Results After adjusting for age, anemia status, sickle cell trait, distance from home to river, residence within a cluster of high S. haematobium transmission, and housing type, baseline P. falciparum mono-infection (n = 254) and co-infection (n = 39) were significantly associated with protection from febrile malaria by Cox regression (hazard ratios 0.71 and 0.44; P = 0.01 and 0.02; reference group: uninfected at baseline). Baseline S. haematobium mono-infection (n = 23) did not associate with malaria protection in the adjusted analysis, but this may be due to lack of statistical power. Anemia significantly interacted with co-infection (P = 0.009), and the malaria-protective effect of co-infection was strongest in non-anemic individuals. Co-infection was an independent negative predictor of lower parasite density at the first febrile malaria episode. Conclusions Co-infection with S. haematobium and P. falciparum is significantly associated with reduced risk of febrile malaria in long-term asymptomatic carriers of P. falciparum. Future studies are needed to determine whether co-infection induces immunomodulatory mechanisms that protect against febrile malaria or whether genetic, behavioral, or environmental factors not accounted for here explain these findings. The parasitic diseases malaria and schistosomiasis are tremendous public health burdens, each affecting over 200 million people worldwide with substantial geographic overlap in sub-Saharan Africa. Understanding how schistosomiasis influences the human immune response to Plasmodium, the agent of malaria, can be important for developing effective malaria vaccines. Past studies have tried to determine if infection with Schistosoma haematobium, which causes urinary schistosomiasis, affects the number of febrile attacks from malaria caused by Plasmodium falciparum in communities where the diseases overlap, but the findings have been inconsistent. Here, we examined 616 healthy people from a village in Mali for symptomless infections with S. haematobium and treated those with infections. We then followed them over a single malaria-transmission season of 7 months during which we diagnosed and treated all febrile malaria attacks. After the season, we examined archived blood collected at enrollment to look for occult P. falciparum infection. The study revealed that people who were infected with both parasites at the beginning of the season were better protected from the malaria attacks than those who were uninfected or infected with either parasite alone. Further studies are needed to confirm these findings and to determine the biological basis for this phenomenon.
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Affiliation(s)
- Safiatou Doumbo
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
- * E-mail: (SD); (TMT)
| | - Tuan M. Tran
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland, United States of America
- * E-mail: (SD); (TMT)
| | - Jules Sangala
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Shanping Li
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland, United States of America
| | - Didier Doumtabe
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Younoussou Kone
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Abdrahamane Traoré
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Aboudramane Bathily
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Nafomon Sogoba
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Michel E. Coulibaly
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Chiung-Yu Huang
- Division of Biostatistics and Bioinformatics, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Aissata Ongoiba
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Kassoum Kayentao
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Mouctar Diallo
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Zongo Dramane
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Thomas B. Nutman
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Peter D. Crompton
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland, United States of America
| | - Ogobara Doumbo
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
| | - Boubacar Traore
- Mali International Center of Excellence in Research, University of Sciences, Techniques, and Technology of Bamako, Bamako, Mali
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Dolo A, Maiga B, Guindo A, Diakité SAS, Diakite M, Tapily A, Traoré M, Sangaré B, Arama C, Daou M, Doumbo O. [Frequency of glucose-6-phosphate dehydrogenase deficiency (A-376/202) in three Malian ethnic groups]. ACTA ACUST UNITED AC 2014; 107:165-70. [PMID: 24952161 DOI: 10.1007/s13149-014-0372-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 04/29/2014] [Indexed: 11/24/2022]
Abstract
Erythrocyte G6PD deficiency is the most common worldwide enzymopathy. The aim of this study was to determine erythrocyte G6PD deficiency in 3 ethnic groups of Mali and to investigate whether erythrocyte G6PD deficiency was associated to the observed protection against malaria seen in Fulani ethnic group. The study was conducted in two different areas of Mali: in the Sahel region of Mopti where Fulani and Dogon live as sympatric ethnic groups and in the Sudanese savannah area where lives mostly the Malinke ethnic group. The study was conducted in 2007 in Koro and in 2008 in Naguilabougou. It included a total 90 Dogon, 42 Fulani and 80 Malinke ethnic groups. Malaria was diagnosed using microscopic examination after Giemsa-staining of thick and thin blood smear. G6PD deficiency (A-(376/202)) samples were identified using RFLP (Restriction Fragment Length Polymorphism) assay and analysis of PCR-amplified DNA amplicon. G6PD deficiency (A-(376/202)) rate was 11.1%, 2.4%, and 13.3% in Dogon, Fulani, and Malinke ethnic group respectively. Heterozygous state for G6PD (A-(376/202)) was found in 7.8% in Dogon; 2.4% in Fulani and 9.3% in Malinke ethnic groups while hemizygous state was found at the frequency of 2.2% in Dogon and 4% in Malinke. No homozygous state was found in our study population.We conclude that G6PD deficiency is not differing significantly between the three ethnic groups, Fulani, Dogon and Malinke.
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Affiliation(s)
- A Dolo
- Département d'épidémiologie des affections parasitaires, Faculté de médecine, de pharmacie et d'odontostomatologie (DEAP/FMPOS), Malaria Research and Training Center (MRTC), BP 1805, Bamako, Mali,
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Niaré-Doumbo S, Normand AC, Diallo YL, Dembelé AK, Thera MA, Diallo D, Piarroux R, Doumbo O, Ranque S. Preliminary study of the fungal ecology at the haematology and medical-oncology ward in Bamako, Mali. Mycopathologia 2014; 178:103-9. [PMID: 24889723 DOI: 10.1007/s11046-014-9760-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 05/13/2014] [Indexed: 12/13/2022]
Abstract
Data on fungal epidemiology in sub-Saharan African countries are scarce. This exploratory study aimed to characterize the fungal flora at the Onco-Haematology ward of the National Teaching Hospital of Point G in Bamako, Mali. A cross-sectional survey was conducted in the dry and in the rainy seasons. Nasal swab and sputum samples were collected from the hospitalized patients while airborne fungal spores were collected using electrostatic dust-fall collectors. Fungi were identified by their morphological characteristics and MALDI-TOF mass spectrometry. Candida albicans was the most frequent yeast species colonizing patients; Aspergillus species were isolated in 86 % of the patients and were the main airborne environmental contaminants. Overall, airborne fungal contamination rates increased from 33.8 % in the dry to 66.2 % in the rainy season (p < 0.001). The most frequent Aspergillus species were Aspergillus niger (36.6 %) and Aspergillus flavus (32.92 %). In contrast, Aspergillus fumigatus (5.43 %) was relatively rare. This high level of fungal exposure raises concern regarding the management of at-risk patients in this Onco-Haematology ward and stresses the need for strengthening the mycological diagnostic capacities to accompany the implementation of adapted fungal infection prevention and management policies.
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Affiliation(s)
- Safiatou Niaré-Doumbo
- Département d'Epidémiologie des Affections Parasitaires/Malaria Research and Training Centre, Faculté de Médecine et d'Odontostomatologie, USTTB, BP 1805, Bamako, Mali
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Al-Awadi AR, Al-Kuhlani A, Breman JG, Doumbo O, Eberhard ML, Guiguemde RT, Magnussen P, Molyneux DH, Nadim A. Guinea worm (Dracunculiasis) eradication: update on progress and endgame challenges. Trans R Soc Trop Med Hyg 2014; 108:249-51. [PMID: 24699360 DOI: 10.1093/trstmh/tru039] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The International Commission for the Certification of Dracunculiasis Eradication (ICCDE) met in December to review progress towards eradication. The status of the programme was presented by WHO and The Carter Center, Atlanta. The Commission received reports from international certification teams that Cote d'Ivoire, Niger and Nigeria were free of transmission and should be certified, while four countries, namely Chad, Ethiopia, Mali and South Sudan, remained endemic. The Commission certified that Somalia and South Africa were free of transmission. During 2013, there was a decline of about 78% in the numbers of cases reported in South Sudan. A report of the perplexing dracunculiasis epidemiology in Chad was also discussed, where dogs have been found to be infected with Dracunculus medinensis.
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Affiliation(s)
- Abdul R Al-Awadi
- Islamic Organization for Medical Science, P.O. Box 31280 Code 90803, Sulaibekhat, Kuwait
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Maiga H, Barger B, Sagara I, Doumbo O, Djimde A. School performance after intermittent preventive treatment using artemisinin-based combination. Int J Infect Dis 2014. [DOI: 10.1016/j.ijid.2014.03.996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Doumbo O. Rickettsial disease in febrile patients in Africa with or without malaria. Int J Infect Dis 2014. [DOI: 10.1016/j.ijid.2014.03.563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Carlini F, Traore K, Cherouat N, Roubertoux P, Buhler S, Cortey M, Simon S, Doumbo O, Chiaroni J, Picard C, Di Cristofaro J. HLA-G UTR haplotype conservation in the Malian population: association with soluble HLA-G. PLoS One 2013; 8:e82517. [PMID: 24376542 PMCID: PMC3871591 DOI: 10.1371/journal.pone.0082517] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 10/24/2013] [Indexed: 12/03/2022] Open
Abstract
The HLA-G molecule plays an important role in immunomodulation. In a previous study carried out on a southern French population our team showed that HLA-G haplotypes, defined by SNPs in the coding region and specific SNPs located in 5'URR and 3'UTR regulatory regions, are associated with differential soluble HLA-G expression (sHLA-G). Furthermore, the structure of these HLA-G haplotypes appears to be conserved in geographically distant populations. The aim of our study is to confirm these expectations in a sub-Saharan African population and to explore additional factors, such as HLA-A alleles, that might influence sHLA-G expression. DNA and plasma samples were collected from 229 Malians; HLA-G and HLA-A genotyping were respectively performed by the Snap Shot® method and by Luminex™ technology. sHLA-G dosage was performed using an ELISA kit. HLA-G and HLA-A allelic and haplotypic frequencies were estimated using an EM algorithm from the Gene[Rate] program. Associations between genetic and non genetic parameters with sHLA-G were performed using a non-parametric test with GRAPH PAD Prism 5. Our results reveal a good conservation of the HLA-G UTR haplotype structure in populations with different origins and demographic histories. These UTR haplotypes appear to be involved in different sHLA-G expression patterns. Specifically, the UTR-2 haplotype was associated with low sHLA-G levels, displaying a dominant negative effect. Furthermore, an allelic effect of both HLA-G and HLA-A, as well as non genetic parameters, such as age and gender possibly linked to osteogenesis and sexual hormones, also seem to be involved in the modulation of sHLA-G. These data suggest that further investigation in larger cohorts and in populations from various ethnical backgrounds is necessary not only to detect new functional polymorphism in HLA-G regulatory regions, but also to reveal the extent of biological phenomena that influence sHLA-G secretion and this might therefore have an impact on transplantation practice.
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Affiliation(s)
- Federico Carlini
- Aix-Marseille Université, CNRS, EFS, ADES UMR 7268, Marseille, France
| | - Karim Traore
- Malaria Research and Training Center, Department of Epidemiology of Parasitic Diseases, Faculty of Medicine, Pharmacy and Dentistry, Bamako, Mali
| | - Nissem Cherouat
- Immuno-genetics laboratory, Etablissement Français du Sang Alpes Méditerranée, Marseille, France
| | - Pierre Roubertoux
- Inserm U491, Génétique Médicale et Développement, Aix-Marseille Université, Faculté de Médecine, Marseille, France
| | - Stéphane Buhler
- Laboratory of Anthropology, Genetics and Peopling history (AGP), Department of Genetics and Evolution – Anthropology Unit, University of Geneva, Geneva, Switzerland
| | - Martì Cortey
- Aix-Marseille Université, CNRS, EFS, ADES UMR 7268, Marseille, France
| | - Sophie Simon
- Immuno-genetics laboratory, Etablissement Français du Sang Alpes Méditerranée, Marseille, France
| | - Ogobara Doumbo
- Malaria Research and Training Center, Department of Epidemiology of Parasitic Diseases, Faculty of Medicine, Pharmacy and Dentistry, Bamako, Mali
| | - Jacques Chiaroni
- Aix-Marseille Université, CNRS, EFS, ADES UMR 7268, Marseille, France
| | - Christophe Picard
- Aix-Marseille Université, CNRS, EFS, ADES UMR 7268, Marseille, France
- Immuno-genetics laboratory, Etablissement Français du Sang Alpes Méditerranée, Marseille, France
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Perdijk O, Arama C, Giusti P, Maiga B, Troye-Blomberg M, Dolo A, Doumbo O, Persson JO, Boström S. Haptoglobin phenotype prevalence and cytokine profiles during Plasmodium falciparum infection in Dogon and Fulani ethnic groups living in Mali. Malar J 2013; 12:432. [PMID: 24274254 PMCID: PMC4225596 DOI: 10.1186/1475-2875-12-432] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 11/22/2013] [Indexed: 11/24/2022] Open
Abstract
Background The Fulani are known to have a lower parasitaemia and less clinical episodes of malaria as compared to the Dogon sympatric ethnic group, living in Mali. Higher circulating malaria-specific antibody titers and increased pro-inflammatory cytokine levels have been shown in Fulani individuals. Several studies have tried to link haptoglobin (Hp) phenotypes with susceptibility to malaria, but without consensus. This study investigated the role of Hp phenotypes and cytokine levels in Dogon and Fulani during asymptomatic Plasmodium falciparum infection. Methods Two different cohorts were combined in this study: a 2008 cohort with 77 children aged between two and ten years and a 2001 cohort, with 82 children and adults, aged between 11 and 68 years. Hp phenotypes in plasma were measured by Western Blot. Circulating levels of sCD163, IL-6, IL-10, IFN-γ and TNF were measured by ELISA. Multiple regression analysis was performed to associate Hp phenotypes with cytokine profiles. In addition, in vitro stimulation of peripheral blood mononuclear cells (PBMCs) with Hp:Hb complexes was performed and cytokine release in corresponding supernatants were measured using cytometric bead array. Results The results revealed a higher Hp2-2 phenotype prevalence in the Fulani. The Hp2-2 phenotype was associated with a higher susceptibility to P. falciparum infection in Dogon, but not in Fulani. In concordance with previous studies, Fulani showed increased inflammatory mediators (IL-6, IFN-γ) and additionally also increased sCD163 levels compared to Dogon, irrespective of infection. Furthermore, infected individuals showed elevated sCD163 levels compared to uninfected individuals, in both Fulani and Dogon. Multiple regression analysis revealed that the Hp1-1 phenotype was associated with higher levels of TNF and IFN-γ, as compared to the Hp2-2 phenotype. In vitro stimulation of PBMCs with Hb:Hp1-1 complexes resulted in a pro-inflammatory cytokine profile, whilst stimulation with Hb:Hp2-2 complexes showed a more balanced profile. Conclusions Ethnicity might be an important confounder on the Hp phenotype-dependent susceptibility to malaria and future studies could consider taking this into account when designing new immunological studies. Although, the relatively small sample size used in this study warrens for precautions in the interpretation of the data and these findings should ideally be validated in a bigger cohort.
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Affiliation(s)
- Olaf Perdijk
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden.
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Mediannikov O, Socolovschi C, Edouard S, Fenollar F, Mouffok N, Bassene H, Diatta G, Tall A, Niangaly H, Doumbo O, Lekana-Douki JB, Znazen A, Sarih M, Ratmanov P, Richet H, Ndiath MO, Sokhna C, Parola P, Raoult D. Common epidemiology of Rickettsia felis infection and malaria, Africa. Emerg Infect Dis 2013; 19:1775-83. [PMID: 24188709 PMCID: PMC3837673 DOI: 10.3201/eid1911.130361] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
This study aimed to compare the epidemiology of Rickettsia felis infection and malaria in France, North Africa, and sub-Saharan Africa and to identify a common vector. Blood specimens from 3,122 febrile patients and from 500 nonfebrile persons were analyzed for R. felis and Plasmodium spp. We observed a significant linear trend (p<0.0001) of increasing risk for R. felis infection. The risks were lowest in France, Tunisia, and Algeria (1%), and highest in rural Senegal (15%). Co-infections with R. felis and Plasmodium spp. and occurrences of R. felis relapses or reinfections were identified. This study demonstrates a correlation between malaria and R. felis infection regarding geographic distribution, seasonality, asymptomatic infections, and a potential vector. R. felis infection should be suspected in these geographical areas where malaria is endemic. Doxycycline chemoprophylaxis against malaria in travelers to sub-Saharan Africa also protects against rickettsioses; thus, empirical treatment strategies for febrile illness for travelers and residents in sub-Saharan Africa may require reevaluation.
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Dabo A, Bary B, Kouriba B, Sankaré O, Doumbo O. Factors associated with coverage of praziquantel for schistosomiasis control in the community-direct intervention (CDI) approach in Mali (West Africa). Infect Dis Poverty 2013; 2:11. [PMID: 23849481 PMCID: PMC3710142 DOI: 10.1186/2049-9957-2-11] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Accepted: 05/13/2013] [Indexed: 11/13/2022] Open
Abstract
Background Despite the progress made in the control of Neglected Tropical Diseases (NTD), schistosome and soil-transmitted helminth infections are far from being effectively managed in many parts of the world. Chemotherapy, the key element of all control strategies, is faced with some difficulties in terms of access to treatment. Our study aims to describe the factors involved in the success or failure of the community-directed intervention (CDI) approach through control programmes, which aims to achieve consistent high coverage at affordable and sustainable costs in endemic areas. Methods The CDI approach was carried out from December 2007 to October 2008 in ten villages of the district of Diéma, Mali. At inclusion, each child part of the study’s sample was interviewed and submitted for a physical examination. The study focused on: data collection, treatment of the eligible population, evaluation of the treatment coverage, performance of community drug distributors (CDDs), and the involvement and perception of populations. Results A total of 8,022 eligible people were studied with a mean coverage rate of 76.7%. Using multiple regression, it was determined that receiving praziquantel as treatment was associated with five factors: belonging to the Fulani or Moorish ethnic minority versus the Bambara/Soninke, use of the central versus the house-to-house drug distribution mode, the ratio of the population to the number of CDDs, the lack of supervision and belonging to the age group of 15 years or above (p<0.05). As well as that, it was found that the presence of parallel community-based programmes (HIV, tuberculosis) that provide financial incentives for community members discouraged many CDDs (who in most cases are volunteers) to participate in the CDI approach due to a lack of incentives. Conclusions The findings indicate that the success of the CDI approach depends on, amongst other things, the personal characteristics of the respondents, as well as on community factors.
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Affiliation(s)
- Abdoulaye Dabo
- Department of Epidemiology of Infectious Diseases, Faculty of Medicine, Pharmacy and Dentistry, UMI 3189, University of Sciences, Techniques and Technologies of Bamako, Box 1805, Bamako, Mali.
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Kouriba B, Diarra A, Doyon I, Baby M, Cissoko T, Kamissoko F, Guitteye H, Doumbo O. Risque de l’infection à Plasmodium et efficience de son dépistage par le test rapide OptiMAL-IT® chez les donneurs de sang de Bamako, Mali. Transfus Clin Biol 2013. [DOI: 10.1016/j.tracli.2013.03.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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