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

Autor: Oo, Sai Zaw Min, Thaung, Sein, Maung, Yan Naung Maung, Aye, Khin Myo, Aung, Zar Zar, Thu, Hlaing Myat, Thant, Kyaw Zin, Minakawa, Noboru
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Zdroj: Parasites & Vectors; 1/6/2018, Vol. 11, p1-N.PAG, 9p
Abstrakt: 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. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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