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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Anopheles gambiae and Anopheles arabiensis population densities and infectivity in Kopere village, Western Kenya
Journal of Infection in Developing Countries, Volume 6, No. 8, Year 2012
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Description
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 village. Because An. gambiae ss largely rests and feeds indoors, use of indoor residual spray and insecticide-treated nets is likely the most suitable approach to malaria vector control in Kopere village and other parts of Kenya where this species is abundant. © 2012 Obala et al.
Authors & Co-Authors
Obala, Andrew Ambogo
Kenya, Eldoret
Moi University
Kenya, Nairobi
Jomo Kenyatta University of Agriculture and Technology
Kutima, Helen Lydiah
Kenya, Nairobi
Jomo Kenyatta University of Agriculture and Technology
Nyamogoba, Henry D.N.
Kenya, Eldoret
Moi University
Mwangi, Ann W.
Kenya, Eldoret
Academic Model Providing Access to Healthcare
Simiyu, Chrispinus J.
Kenya, Eldoret
Academic Model Providing Access to Healthcare
Magak, Gideon N.
Kenya, Eldoret
Moi University
Khwa-Otsyula, Barasa O.
Kenya, Eldoret
Moi University
Ouma, John Henry
Kenya, Nairobi
Institute of Tropical Medicine and Infectious Diseases
Statistics
Citations: 14
Authors: 8
Affiliations: 4
Identifiers
Doi:
10.3855/jidc.1979
Research Areas
Infectious Diseases
Study Design
Cross Sectional Study
Study Locations
Kenya
Participants Gender
Female