The persistence insecticides use to impregnated nets for malaria control in Nakhon Si Thammarat Province

Abstract

The objective of this study was to compare the persistence of 3 different insecticides used to impregnate mosquito nets. These were Deltamethrin 25% tablet at an average concentration of 25-30 mg/m², Bifentrin 25% (25-30 mg/m²) and Cyfluthrin 5% EW (40-50 mg/m²). The study was carried out in the field areas under the responsibility of the Office of Disease Prevention and Control No. 11, Nakorn Si Thammarat province (ODPC 11). Anopheles minimus mosquito, aged 3-5 days, full feeding with blood or 10% sugar, obtained from the insectariums of the ODPC 11 and Bureau of the Vector-borne Diseases were used to conduct bioassay test 6 months after the impregnation. The results showed that after 6 months, the unused and never been washing mosquito nets impregnated by 3 different insecticides (Deltamethrin 25% tablet at an average concentration of 25-30 mg/m², Bifentrin 25% [25-30 mg/m²] and Cyfluthrin 5% EW [40-50 mg/m²]) were still able to kill the tested mosquitoes 85, 87.5 and 80%, respectively. It was implied that these insecticide treated mosquito nets were effective for controlling malaria vectors for at least 6 months.