RESISTANCE STATUS IN ANOPHELES GAMBIAE AND PLASMODIUM FALCIPARUM TRANSMISSION IN TORI-BOSSITO DISTRICT, SOUTHERN BENIN, WEST-AFRICA

In prelude to a large scale trial aiming to assess the field efficacy of Fludora Fusion 562.5WP-SB, entomologic baseline data were collected in 14 villages from Tori-Bossito District in Southern Benin during the rainy season from April to May 2018. Malaria vectors aggressiveness and longevity, Plasmodium falciparum infection in malaria vectors, malaria entomologic transmission as well as insecticide resistance status in malaria vectors were determinate. Overall 2695 mosquitoes were collected during 504 persons*nights. Among mosquitoes collected, 408 were Anopheles gambiae s.l. and 43 Anopheles funestus s.l. The proportion of parous malaria vectors was 54.2% and 79.1% for An. gambiae s.l. and An. funestus s.l. respectively. A sample of 68 malaria vectors was tested for Plasmodium falciparum infection using quantitative Polymlerase Chain Reaction (qPCR). The infection rate was about 6% (4/68 vectors infected) corresponding to 1.58 infective bites per person per month. The mortality rate of An. gambiae s.l. exposed to deltamethrin 0.05%, pyrimiphos-methyl 0.25% and clothianidin at 9µg/ml was 38%, 98.86% and 100% respectively, indicating that An. gambiae s.l. was resistant to deltamethrin and susceptible to pyrimiphos-methyl and clothianidin.This study showed that An. gambiae s.l. and An. funestus s.l. are the two major vectors with a predominance of An. gambiae s.l.