Susceptibility of Anopheles dirus to 0.05% Deltamethrin in Buachet district, Surin province
Keywords:
Susceptibility, Anopheles Mosquitoes, MalariaAbstract
Malaria remains a major public health problem in many countries, particularly in Southeast Asia, including Thailand. The primary vectors responsible for malaria transmission are Anopheles mosquitoes. The study was an experimental research study. The objective was to assess the susceptibility of Anopheles dirus mosquitoes to 0.05% deltamethrin in Buachet district, Surin province. A total of 34 Anopheles dirus mosquitoes were collected from natural sources. The mosquitoes were tested for susceptibility to 0.05% deltamethrin in the laboratory, following WHO guidelines. Data were analyzed using descriptive statistics (including frequency and percentage) to describe knockdown and mortality rates, while probit analysis was employed to calculate the knockdown time for 50% (KT50) of mosquitoes. The results showed that after 20 minutes of exposure to 0.05% deltamethrin, 15.63% of mosquitoes were knocked down. Mosquitoes were 100% knocked down at 40, 50, and 60 minutes. The KT50 was 23.06 minutes. After rearing the knocked-down mosquitoes for 24 hours, the mortality rate was 100%. The findings demonstrated that Anopheles dirus mosquitoes in this study area are susceptible to 0.05% deltamethrin. Therefore, 0.05% deltamethrin is effective in eliminating Anopheles dirus mosquitoes. This indicated that 0.05% deltamethrin could be used in strategic planning and effective control measures for the malaria vector. Moreover, the insecticide susceptibility of Anopheles mosquitoes should be monitored to prevent the development of resistance in vector populations.
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