Distribution and abundance of Aedes aegypti and Aedes albopictus (Diptera: Culicidae) in Benin, West Africa

Abstract

Abstract Background Updated information on the distribution and abundance of Aedes aegypti and Aedes albopictus is crucial to prepare African countries like Benin for possible arbovirus outbreaks. This study aims to evaluate the geographical distribution, the abundance, and the biting behaviors of these two vectors in Benin. Methods Three sampling techniques (Human Landing Catch (HLC), Larval sampling, and Ovitrapping) were used to collect both immature and adult stages of Aedes spp in 23 communes located along the North-South and East-West transect of Benin. Adult Aedes mosquitoes were collected indoors and outdoors using HLC. Mosquito eggs, larvae, and pupae were collected from containers and ovitraps and morphologically identified, then confirmed by Polymerase Chain Reaction (PCR). Results Overall, 12,428 adult specimens of Aedes spp, out of which 76.53% (n = 9508) and 19.32% (n = 2400) were morphologically identified as Ae. aegypti, and Ae. albopictus respectively. Geographically, Ae. aegypti was encountered across the North South transect unlike Ae. albopictus which was only encountered in the southern part of the country, with a strong preponderance in Avrankou and Ifangni. Furthermore, exophagic behaviors were observed in both vectors. Conclusion This updated distribution of Aedes mosquitoes in Benin will help to accurately identify areas at risk of arboviruses, to better plan future vector control interventions.