Susceptibility of Aedes aegypti to Insecticides in Viet Nam

During 2000-2002, studies on the susceptibility of Aedes aegypti to insecticides were conducted at 22 places in 11 provinces and cities in four different regions of Viet Nam. Aedes aegypti was found susceptible to malathion, but resistant to DDT in almost all the study sites. It continues to be susceptible to the pyrethroid group of insecticides (permethrin, lambda-cyhalothrin, deltamethrin and alphacypermethrin) in many places in the North and Centre regions, but is resistant to these insecticides in many places in the South and Central Highlands in Viet Nam. However, the species was found highly and widely resistant to etofenprox.