OBJECTIVE: To determine whether the Koka water reservoir in the Rift Valley of Ethiopia contributes to the malaria burden in its vicinity. METHODS: Frequency of malaria diagnosis in fever clinics was correlated with distance of residence from the margin of the Koka reservoir. Annual as well as seasonal malaria case rates were determined in cohorts residing < 3, 3-6 and 6-9 km from the reservoir. Plasmodium falciparum risk was compared with that of Plasmodium vivax. A multiple variable regression model was used to explore associations between malaria case rates and proximity to the reservoir, controlling for other suspected influences on malaria transmission. RESULTS: Malaria case rates among people living within 3 km of the reservoir are about 1.5 times as great as for those living between 3 and 6 km from the reservoir and 2.3 times as great for those living 6-9 km from the reservoir. Proximity to the reservoir is associated with greater malaria case rates in periods of more intense transmission. Plasmodium falciparum is most prevalent in communities located close to the reservoir and P. vivax in more distant villages. The presence of the reservoir, coupled with inter-annual climatic variations, explains more than half of the region's variability in malaria case rates. CONCLUSION: Large water impoundments are likely to exacerbate malaria transmission in malaria-endemic parts of sub-Saharan Africa.
OBJECTIVE: To determine whether the Koka water reservoir in the Rift Valley of Ethiopia contributes to the malaria burden in its vicinity. METHODS: Frequency of malaria diagnosis in fever clinics was correlated with distance of residence from the margin of the Koka reservoir. Annual as well as seasonal malaria case rates were determined in cohorts residing < 3, 3-6 and 6-9 km from the reservoir. Plasmodium falciparum risk was compared with that of Plasmodium vivax. A multiple variable regression model was used to explore associations between malaria case rates and proximity to the reservoir, controlling for other suspected influences on malaria transmission. RESULTS:Malaria case rates among people living within 3 km of the reservoir are about 1.5 times as great as for those living between 3 and 6 km from the reservoir and 2.3 times as great for those living 6-9 km from the reservoir. Proximity to the reservoir is associated with greater malaria case rates in periods of more intense transmission. Plasmodium falciparum is most prevalent in communities located close to the reservoir and P. vivax in more distant villages. The presence of the reservoir, coupled with inter-annual climatic variations, explains more than half of the region's variability in malaria case rates. CONCLUSION: Large water impoundments are likely to exacerbate malaria transmission in malaria-endemic parts of sub-Saharan Africa.
Authors: Alain Nahum; Annette Erhart; Ambroisine Mayé; Daniel Ahounou; Chantal van Overmeir; Joris Menten; Harry van Loen; Martin Akogbeto; Marc Coosemans; Achille Massougbodji; Umberto D'Alessandro Journal: Am J Trop Med Hyg Date: 2010-09 Impact factor: 2.345
Authors: Michael C Wimberly; Alemayehu Midekisa; Paulos Semuniguse; Hiwot Teka; Geoffrey M Henebry; Ting-Wu Chuang; Gabriel B Senay Journal: Trop Med Int Health Date: 2012-08-05 Impact factor: 2.622
Authors: Nicolas Senn; Patricia Rarau; Danielle I Stanisic; Leanne Robinson; Céline Barnadas; Doris Manong; Mary Salib; Jonah Iga; Nandao Tarongka; Serej Ley; Anna Rosanas-Urgell; John J Aponte; Peter A Zimmerman; James G Beeson; Louis Schofield; Peter Siba; Stephen J Rogerson; John C Reeder; Ivo Mueller Journal: PLoS Med Date: 2012-03-27 Impact factor: 11.069