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Impacts of rice production on the incidence of mosquitoes and malaria transmission in the district of Malanville, Northen Benin

Badou Yvette, Yadouleton Anges, Dramane Gado, Hounkanrin Gildas, Tchibozo Carine, Sanoussi Falilath, Baba-Moussa Lamine

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Int. J. Biosci.21(4), 18-24, October 2022

DOI: http://dx.doi.org/10.12692/ijb/21.4.18-24


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To evaluate the impact of rice production on malaria transmission in the district of Malanville in northern Benin, an entomological study was carried out from January to December 2021. Therefore, human landing catches (HLC) activities were conducted over two consecutive nights in 6 random houses selected from each study site for adult mosquito collection monthly. Additionally, indoor pyrethrum spray catches (PSC) were done in 6 additional houses at each study site. This scheme of mosquito sampling was the same each month during the study period. Female mosquitoes collected by HLC particularly the Head-thoraces of these mosquitoes were tested for the presence of circumsporozoite protein (CSP). Mosquitoes collected by PSC were used for species identification based on the Polymerase chain reaction (PCR) technic. Results from this study showed a total of 63,012 female mosquitoes were caught from the two methods whereas 58,285 were by HLC. Plasmodium falciparum was mainly transmitted by Anopheles gambiae s.s and Anopheles arabiensis where malaria transmission was high from June to November during the rainy season and declined during the dry season (December-May). The average entomological inoculation rate (EIR) was significantly higher during the rainy season compared to the dry season (p<0.05). These findings showed that rice production increased mosquito fauna but doesn’t have a significant impact on malaria transmission. Therefore, communities living close to rice production areas will permanently be exposed to mosquito bites throughout the year.


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Impacts of rice production on the incidence of mosquitoes and malaria transmission in the district of Malanville, Northen Benin

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