Current Insecticide Resistance Status in Aedes Aegypti Mosquito Populations from Mono Department and its Implications for Dengue Control in South-Western Republic of Benin, West Africa
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Abstract
Aedes aegypti, an important vector in the transmission of human diseases has developed resistance to commonly used classes of insecticides in populations worldwide in public health. The current study was aimed to investigate on the current insecticide resistance status in Aedes aegypti mosquito populations from Mono department and its implications for dengue control in South-western Republic of Benin, West Africa. Larvae and pupae of Aedes aegypti populations were collected from the breeding sites in Mono department from March to July 2023 during the great rainy season. WHO susceptibility tests were conducted on unfed female mosquitoes aged 2-5 days old. WHO bioassays were performed with impregnated papers of dichlorodiphenyltrichloroethane (DDT) (4%), permethrin (0.75%), deltamethrin (0.05%), fenitrothion (1%) and bendiocarb (0.1%). The results showed Aedes aegypti mosquito populations were resistant to DDT, permethrin and deltamethrin insecticides but susceptible to fenitrothion and bendiocarb. There is cross-resistance to both pyrethroid and organochlorine insecticides. However, the physical barrier of Long Lasting Insecticidal Nets (LLINs) which are frequently distributed free by Beninese National Malaria Control Program throughout the entire country to increase coverage of LLINs is still important despite the insecticide resistance observed.
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