Establishment of the correlation between resistance level to deltamethrin and physiological age of An. gambiae sensu lato populations from Dogbo district in South-Western Benin, West Africa

The current study was aimed to establish the correlation between the resistance level to deltamethrin and physiological age of An. gambiae sensu lato populations from Dogbo district in South-Western Benin, West Africa. Female An. gambiae s.l. mosquitoes were collected from window traps put on windows of rooms in Dogbo district surveyed. An. gambiae s.l. mosquitoes were collected from March to July and August to November 2020 during the rainy season in the locations of Ayomi, Dévé, Honton, Lokogohoué, Madjrè and Totchangni. Female An. gambiae species were morphologically identified using morphological keys and then transferred into mosquito cages for WHO bioassays performed with impregnated papers of deltamethrin (0.05%). The physiological age of adult female An. gambiae was determined through dissection using Detinova method. The results showed that more An. gambiae mosquitoes were old, more they were susceptible to deltamethrin. Otherwise, the young An. gambiae mosquitoes were more resistant to deltamethrin than the old. There is a correlation between resistance level to deltamethrin and physiological age of An. gambiae sensu lato populations from Dogbo district in South-Western Benin.