ANOPHELES SPECIES DIVERSITY, SUSCEPTIBILITY STATUS OF MALARIA VECTORS TO INSECTICIDES IN TWO COMMUNES WITH HIGH MALARIA TRANSMISSION IN DAK LAK AND KHANH HOA PROVINCES

Abstract

This study determined the species diversity of Anopheles mosquitoes andsusceptibility status of malaria vector to insecticides in high malaria endemic communesof Khanh Hoa (Khanh Vinh District) and Dak Lak (Ea So District) provinces, located inthe Central Highlands in 2021. Anopheline mosquitoes were collected by the threesampling methods as human-landing catch, CDC light trap, and cattle shed collections.Mosquitoes were initially identified using morphological characters and susceptibility testby WHO bioassay. The results showed: Overall, 3.188 Anopheles females belongs to 14species were collected, 1.815 individuals from Khanh Hoa, with 67,2% and 32,8% invillage and plot hut areas, respectively, and 1.374 individuals from Dak Lak province,with 912 individuals in village and which 462 in plot hut areas. Three malaria vectorswere detected in both communes, the main vector of An. dirus was the most predominantspecies in plot hut area of both communes, and this species was collected mainly byhuman landing catch method. An. aconitus was the most prevalent species in village areain both communes.The main vector of An. dirus was susceptible (mortality rate of 100%) to alphacypermethrin in both communes. The secondary vector of An. aconitus was susceptible toalpha-cypermethrin and deltamethrin in Khanh Thanh commnune. However, in Ea Socommune, An. aconitus was remained susceptible to alpha-cypermethrin (mortality rate of100%) but possible resistance to detlamethrin with 95% mortality.