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Emergence and spread of resistance among vectors toward different insecticides is a serious problem for the Japanese encephalitis (JE) control program. Regularly monitoring the status of susceptibility of vector species to insecticides is important for formulating proper vector control measures. In this study, we studied the susceptibility status of major JE vectors from northern West Bengal, toward 4% DDT, 0.05% deltamethrin, and 5% malathion. Two- to three-day-old unfed female mosquitoes were subjected to a susceptibility bioassay using a World Health Organization kit. Corrected mortality (CM) and knockdown times were estimated. Culex tritaeniorhynchus, Cx. vishnui, Cx. pseudovishnui, and Cx. gelidus were the major JE vectors present in the study areas. All 4 vector species were highly tolerant to DDT with CM  90%. Cx. tritaeniorhynchus, Cx. vishnui, Cx. pseudovishnui, and Cx. gelidus were tolerant to deltamethrin with CM  90%, except for Cx. gelidus of Darjeeling and Malbazar. At most of the study sites, malathion was effective against Cx. vishnui, Cx. pseudovishnui, and Cx. gelidus with CM ≥ 98%. In contrast, Cx. tritaeniorhynchus was tolerant to malathion in all study areas. Predominant JE vector populations were highly tolerant to all 3 analyzed insecticides, except deltamethrin for Cx. gelidus and malathion for Cx. vishnui, Cx. pseudovishnui, and Cx. gelidus. The results of this study may be useful for better planning and implementing a JE control strategy.

The Status of Susceptibility of Japanese Encephalitis Vectors to Insecticides in Endemic Areas of Northern Districts of West Bengal, India