Effectiveness of a novel long-lasting pyriproxyfen larvicide (SumiLarv®2MR) against Aedes mosquitoes in schools in Yangon, Myanmar.

ABSTRACT

BACKGROUND: Mosquito-borne diseases are prevalent in Myanmar, with the number of dengue cases showing a significant increase in recent years. Dengue vectors have developed resistance to insecticides and currently used larvicides show only short-term effectiveness. As a result, an alternative larvicide is urgently needed. The present study evaluated the larvicidal effectiveness of long-lasting pyriproxyfen resin discs (SumiLarv®2MR) against dengue virus vectors in schools in Hlaing Thar Yar Township, Yangon. RESULTS: The proportion of Aedes mosquito-infested containers was significantly reduced in the schools applied with the larvicide (OR 0.24, 95% CI 0.12-0.48) while there was little reduction noted in the control schools (OR 0.97, 95% CI 0.55-1.72). The density of infested containers was also significantly reduced in the intervention schools (Beta -1.50, 95% CI -1.98- -1.04), but there was no significant reduction in density in the control schools (Beta -0.19, 95% CI -0.53-0.14). The proportion of adult emergence was less than 20% in the treated water collected from the intervention schools for six months, while the proportion was over 90% in the untreated water. In addition, eight-month-old SumiLarv®2MR resin discs were still 100% effective when tested in the laboratory. More than 50% of the discs disappeared from treated containers within two months of intervention. CONCLUSIONS: SumiLarv®2MR was effective in reducing Aedes-infested containers at least six months after its application in schools. This new pyriproxyfen formulation has great potential for improving the current dengue vector control program in Myanmar.