A comparative study on residual effects of Cyfluthrin 5% EW and Permethrin 10% EC on impregnated bed nets against An. minimus

Abstract

This study was carried out to compare the residual effects of Cyfluthrin 5% EW and Permethrin 10% EC on impregnated bed nets against Anopheles minimus, a main vector of malaria. Two dosages of Cyfluthrin 5% EW (25 and 30 mg/m2) and one dosage of Permethrin 10% EC (300 mg/m2) were tested. Contact Bioassay Tests were carried out in a village of Lopburi Province during a period of 6 months. We found that dosages of Cyfluthrin 5% EW showed slightly longer killing effectiveness than that of Permethrin 10% EC. By the end of this study (6th month), bed nets applied with Cyfluthrin 5% EW, either 25 or 30 mg/m2, resulted in 100% mortality of mosquitoes. Whereas bed nets applied with 300 mg/m2 of Permethrin 10% EC resulted in 100% mortality of mosquitoes only up to the 3rd months post application. After that, mortality of mosquitoes gradually declined to 97.5%.