Annals of Tropical Medicine and Public Health
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Year : 2017  |  Volume : 10  |  Issue : 6  |  Page : 1439-1442

Insecticide resistance of temephos on Aedes aegypti as dengue vector in Samut Songkhram, Thailand

College of Allied Health Sciences, Suan Sunandha Rajabhat University, Bangkok, Thailand

Correspondence Address:
Tanawat Chaiphongpachara
College of Allied Health Sciences, Suan Sunandha Rajabhat University, Bangkok
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ATMPH.ATMPH_127_17

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Background: Dengue hemorrhagic fever, vector by Ae. aegypti, is a world common public health problem, particularly in tropical and subtropical area including Thailand. Samut Songkhram also has an epidemic of this disease. To control the spread, we focus on decreasing Ae. aegypti larva in the area. In Samut Songkhram, people mostly use temephos, which might cause a resistance in mosquitoes. Aims: The purpose of this research is to test resistance of Ae. aegypti against temephos(GPO-1 and Zeolite) and compare temephos's resistant rate in epidemic subdistricts, Ladyai; Suan Luang; and Jompluak of Samut Songkhram province, Thailand. Settings and Design: Experimental research. Subjects and Methods: We used temephos chemicals from 2 brands: GPO-1(Temephos 1% W/W Sand Granule) and Zeolite(Temephos 1% W/W Zeolite Granule). First, prepare solutions of GPO-1 and Zeolite into 5 concentrations: 100, 10, 1, 01, and 0.012 ml/L of water. Then, pour 100 ml of each solution into sampling containers for tested Ae. aegypti and 100 ml of distilled water for controlled Ae. aegypti. After that, add 10 larvae in each container, classifying by area.Repeat the experiment in all concentrations 3times and compared with controlled Ae. aegypti and Bora Bora strain F181(susceptible strain). Statistical Analysis Used: Calculate data of the death of mosquito larvae at 5 concentrations: 100, 10, 1, 0.1, and 0.012ml/L to find median lethal concentration(LC50and LC90) and (RR50and RR90) with probit analysis method. Compare average death of mosquito larvae in each subdistrict by Kruskal–Wallis One-way ANOVA, using SPSS software. Results: From the studies, we found that Ae. aegypti in these 3 areas has no resistance against temephos of both brand(RR<5) and no statistic difference(P<0.05) among all three subdistricts. Conclusions: Alsthough, there are reports of temephos resistance of mosquito larva in many areas of Thailand, but the results of our study showed no resistance in Samut Songkhram provice. This support is that the mortality of the larvae in experiment groups were not different among control groups. thus, this research result showed that temephos chemical is still an efficient insecticide to eradicate Ae. aegypti in Samut Songkhram province, Thailand.

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