Susceptibility of two cambodian population of Aedes aegypti mosquito larvae to temephos during 2001

Two population of Aedes aegypti, i.e Phnom Penh (temephos-treated area) and Kampong Cham (area untreated with temephos) were evaluated for their susceptibility to temephos. Larval bioassays were carried out in accordance with QHO standard methods. Results showed that, when compared with the WHO diagnostic dosage of 0.02 mg/l, the Phnom Penh population was resistant (LC95: 0.034mg/l) whereas that of Kampong Cham was susceptible (LC95: 0.015mg/l). 95% confidence intervals of 0.0298 - 0.0382 and 0.0115 - 0.0193, respectively, did not overlap, indicating that the difference in susceptibility between thw two populations was significant. Resistant of Ae. aegypti to temephos appears to be incipient in Camboida. More studies are reuqired with wider representations of localities.