Anopheles gambiae and Anopheles arabiensis population densities and infectivity in Kopere village, Western Kenya

作者：Andrew Ambogo Obala, Helen L. Kutima, Henry Nyamogoba, Anne Wanjiru Mwangi, Chrispinus J Simiyu, Gideon N Magak, Barasa O. Khwa-Otsyula, John Henry Ouma · 发表于：The Journal of Infection in Developing Countries · 年份：2012 · DOI：10.3855/jidc.1979 · 被引用次数：8 · 研究领域：Malaria Research and Control、Invertebrate Immune Response Mechanisms、Parasitic Diseases Research and Treatment

INTRODUCTION: This study was conducted in a sugar belt region of western Kenya interfacing epidemic and endemic malaria transmission. We investigated Anopheles gambiae sensu stricto (ss) and Anopheles arabiensis species compositions and densities, human host choice, and infectivity. METHODOLOGY: Mosquitoes were captured using pyrethrum spray catch technique and first identified based on morphology; species were confirmed by PCR. Blood meal preference and sporozoite rates were determined by ELISA. Parity rates and entomological inoculation rates (EIR) were determined. Seasonal densities were compared against environmental temperatures, relative humidity and rainfall. RESULTS: In total 2,426 An. gambiae were collected. Out of 1,687 female blood-fed mosquitoes, 272 were randomly selected for entomological tests. An. gambiae ss and An. arabiensis comprised 75% (205/272) and 25% (68/272) of the selection, respectively. An. gambiae ss had higher preference for human blood (97%; n=263/272) compared with An. arabiensis, which mostly fed on bovines (88%; n=239/272). The sporozoite and parity rates were 6% (16/272) and 66% (179/272) for An. gambiae ss and 2% (4/272) and 53% (144/272) for An. arabiensis respectively, while EIR was 0.78 infective bites/person/night. Climate (ANOVA; F=14.2; DF=23) and temperature alone (r=0.626; t=3.75; p=0.001) were significantly correlated with vector densities. CONCLUSION: An. gambiae ss are the most efficient malaria vector mosquito species in Kopere ...