Abstract
The current study was aimed to compare the susceptibility to deltamethrin in female adult Anopheles gambiae s.l. from Dogbo district with their F1 progeny susceptibility in South-Western Benin, West Africa. Larvae and pupae of Anopheles gambiae s.l. populations were collected from the breeding sites in Couffo department in 2020 and reared up for obtaining F1 progeny. Female adult An. gambiae s.l. mosquitoes were also 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 adult An. gambiae species collected from window traps were morphologically identified using morphological keys and then transferred into mosquito cages for WHO bioassays performed with impregnated papers of deltamethrin (0.05%). WHO bioassays were also performed with F1 progeny. The physiological age of female adult An. gambiae s.l. collected from window traps was determined through dissection using Detinova method. The results showed that the mortality rates recorded with female adult An. gambiae s.l. mosquitoes collected from window traps were higher than those obtained with their F1 progeny An. gambiae s.l. mosquitoes obtained after reproduction of parent mosquitoes. The current study clearly shows that changes in mosquito physiology occur with senescence.
Highlights
National programmes reported that 135 million people representing 4% of the global population at risk were protected by IRS in 2012
The 24 hours mortality recording shows that female Anopheles gambiae Kisumu which were exposed to WHO papers impregnated with deltamethrin (0.05%) were fully susceptible to this product
Female adult An. gambiae s.l. mosquitoes collected from window traps put on windows of rooms in Dogbo district surveyed were those from emergence of pupae of Anopheles gambiae s.l. populations collected from the breeding sites using the dipping method
Summary
National programmes reported that 135 million people representing 4% of the global population at risk were protected by IRS in 2012. The proportion of the population protected by IRS increased substantially in the African Region during 2006 and 2008, and the increased coverage was maintained during 2009 and 2011, at 10% and 12% of the population at risk. In 2012, a total of 58 million people, or 8% of the population at risk, were protected [1]. IRS involves the application of residual insecticides to the inner surfaces of dwellings targeting Anopheles mosquitoes that rest on walls after having taken a blood meal. IRS programmes can rapidly reduce local malaria incidence and mortality, provided that most houses and animal shelters in targeted communities are sprayed. WHO recommends the spraying ofat least 80% (and ideally 100%) of houses, structures and units in the targeted area inany round of spraying [2]
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