EFFECTIVENESS OF REPELLENT FORMULATIONS CONTAINING DEET AGAINST MOSQUITOS IN NORTHEASTERN THAILAND

Formulations of the repellent diethyl methyl benzamide (deet) were eva luated against mosquitoes in field tests conducted in Sisaket Province , northeastern Thailand. Thirty-three percent deer in an applicator st ick provided greater than or equal to 87.1% protection against primari ly Culex vishnui, Cx. gelidus, and Cx. tritaeniorhynchus for up to 5 h , and 50% deer in ethanol provided greater than or equal to 93.3% prot ection against Anopheles sp. and culicines for up to 8 h. The U.S. Arm y Extended Duration Repellent Formulation ([EDRF], containing 33% deet ), 50% deet in ethanol, and 75% deet in ethanol provided complete prot ection for up to 6 h against primarily Culex vishnui and Anopheles dir us.