n African Entomology - Species composition and biting activities of anthropophilic and their role in malaria transmission in a holo-endemic area of southwestern Nigeria

Volume 11, Issue 2
  • ISSN : 1021-3589



The species composition of indoor and outdoor human-biting mosquitoes and their relative contribution to transmission were determined for two communities in Ibadan, southwestern Nigeria where little or no data were available. Mosquitoes attracted to humans at night were caught in August, September and October 2000, coinciding with the peak malaria period in these areas. A total of 2176 were collected, of which was predominant followed by and . The results of PCR-based tests identified 58.8 % of the as , and 41.2% as . The molecular (M and S) forms of were found in the ratio 1:3, respectively. A cocktail PCR-assay differentiated 65.6% of the group as , and 34.4% as . Outdoor biting mosquito numbers were significantly higher ( < 0.001) than that observed indoors. Peak indoor and outdoor biting activities of occurred at 01:00 and 24:00, respectively. The biting activities of both indoors and outdoors attained a peak at 23h00 while and were more exophagic. The results of ELISA-based analyses indicated that and serve as vectors in the area with an overall sporozoite infection rate of 5.6 %, 4.0% and 4.3 %, respectively. Both and tested negative. The combined contribution of these mosquito species to malaria transmission in the study area highlights the inappropriateness of vector control strategies aimed at only one vector species.

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