Insecticide Resistance in Mosquito Populations: Mechanisms, Distribution, Public Health Impact, and Management Strategies

Abstract 
Mosquito-borne diseases continue to represent 
a major global health burden, particularly in 
tropical and subtropical regions where 
environmental conditions favor mosquito 
breeding and survival. Vector species such as 
Aedes aegypti, Anopheles stephensi, and 
Culex quinquefasciatus are responsible for the 
transmission of dengue, malaria, chikungunya, 
Zika virus infection, Japanese encephalitis, 
and lymphatic filariasis. Chemical insecticides 
remain the most widely used tools for vector 
control through indoor residual spraying, 
insecticide-treated bed nets, larviciding, and 
space spraying. However, the continuous and 
often indiscriminate use of insecticides has 
resulted in the rapid development of resistance 
in mosquito populations across the world. 
This research project investigates the 
occurrence and intensity of insecticide 
resistance in selected mosquito populations 
and examines the biochemical and molecular 
mechanismsunderlyingresistancedevelopment. 
Standard WHO susceptibility bioassays, 
enzyme activity assays, and molecular 
diagnostic techniques were employed to 
determine resistance status and identify 
genetic mutations associated with reduced 
insecticide sensitivity. The results revealed 
high levels of resistance to pyrethroids and 
organochlorines, moderate resistance to 
organophosphates, and comparatively lower 
resistance to carbamates. Elevated 
detoxification enzyme activity and  

the presence of knockdown resistance (kdr) 
mutations were identified as major 
mechanisms contributing to resistance. The 
findings emphasize the urgent need for 
continuous resistance monitoring and 
integrated vector management strategies to 
ensure sustainable mosquito control and 
disease prevention.