Impact of the okyereko irrigation project in Ghana on the risk of human malaria infection by anopheles species (diptera: Culicidae).
dc.contributor.author | Okoye, P.N. | |
dc.contributor.author | Wilson, M.D. | |
dc.contributor.author | Boakye, D.A. | |
dc.contributor.author | Brown, C.A. | |
dc.date.accessioned | 2013-06-28T12:44:01Z | |
dc.date.accessioned | 2017-10-16T11:37:01Z | |
dc.date.available | 2013-06-28T12:44:01Z | |
dc.date.available | 2017-10-16T11:37:01Z | |
dc.date.issued | 2005 | |
dc.description.abstract | The impact of an irrigation scheme on malaria transmission in coastal savanna was studied. Adult mosquitoes (Diptera : Culicidae) were sampled using human landing and pyrethrum spray catches at Okyereko (irrigated village) and at Bewadze (non-irrigated, 9.5 km away) during the dry season of 2002/2003. Each mosquito was first identified morphologically as <I>Anopheles gambiae</I> Giles, then to sibling species by PCR and <I>An. gambiae s.s.</I> forms were further identified by restriction analysis. The parity of <I>Anopheles</I> mosquitoes were determined and ELISA-based methods used to determine <I>Plasmodium falciparum</I> sporozoite infections and host blood meal source. More <I>Anopheles</I> mosquitoes were obtained at Okyereko. Members of the <I>An. Gambiae</I> complex were dominant at Okyereko and <I>An. funestus</I> at Bewadze. Within the <I>An. gambiae</I> complex, only <I>An. gambiae s.s.</I> was identified, and the M form constituted 91.7 % at Okyereko and 66.7 % at Bewadze. The biting rate was higher at Okyereko, but parous rates were similar in both villages. The infection rates were 2.5-fold higher in <I>An. funestus</I> than <I>An. gambiae</I> at both sites, but were 17.5-fold lower at Okyereko. At Okyereko, the four infective <I>An. gambiae s.s.</I> were found to be the M form while at Bewadze three of the four infective <I>An. gambiae s.s.</I> were found to be the S form and one was the M form. The entomological inoculation rate was also significantly lower at Okyereko. The human blood index was 84.1 % at Okyereko and 77.1 % and Bewadze. Malaria risk was therefore lower at the irrigated village and the likely reason is the low numbers of <I>An. funestus</I> and <I>An. gambiae s.s.</I> S form. | en_US |
dc.identifier.citation | Okoye, P. N., Wilson, M. D., Boakye, D. A., & Brown, C. A. (2005). Impact of the okyereko irrigation project in Ghana on the risk of human malaria infection by anopheles species (diptera: Culicidae). African Entomology, 13(2), 249-253. . | en_US |
dc.identifier.issn | 10213589 | |
dc.identifier.uri | http://197.255.68.203/handle/123456789/4285 | |
dc.language.iso | en | en_US |
dc.title | Impact of the okyereko irrigation project in Ghana on the risk of human malaria infection by anopheles species (diptera: Culicidae). | en_US |
dc.type | Article | en_US |