Susceptibility status of Japanese Encephalitis vectors to insecticides in endemic areas of northern districts of West Bengal, India.

Susceptibility status of Japanese Encephalitis vectors to insecticides in endemic areas of northern districts of West Bengal, India. Jpn J Infect Dis. 2017 Dec 26;: Authors: Saha P, Ballav S, Chatterjee M, Ganguly S, Sarker M, Biswas AK, Pramanik T, Basu N, Maji AK Abstract Emergence and spread of resistance among vectors against different insecticides is a serious problem for Japanese encephalitis (JE) control programme. Regular monitoring of susceptibility status of vector species to insecticides is important for formulating proper vector control measures. We have studied the susceptibility status of major JE vectors from northern West Bengal, against 4% DDT, 0.05% deltamethrin and 5% malathion. Two to three days old unfed female mosquitoes were subjected to susceptibility bioassay using WHO kit. Corrected mortality and knockdown times were estimated. Culex tritaeniorhynchus, Cx. vishnui, Cx. pseudovishnui and Cx. gelidus were the major JE vectors in the study areas. All four vector species were highly tolerant to DDT with corrected mortality (CM) <90%. Cx. tritaeniorhynchus, Cx. vishnui, Cx. pseudovishnui, Cx. gelidus were tolerant to deltamethrin with CM <90% except Cx. gelidus of Darjeeling and Malbazar. In most of the study sites, malathion was effective against Cx. vishnui, Cx. pseudovishnui and Cx. gelidus with CM ≥98%. But Cx. tritaeniorhynchus was tolerant to malathion in all study areas. Predominant JE vector popul...
Source: Japanese Journal of Infectious Diseases - Category: Infectious Diseases Authors: Tags: Jpn J Infect Dis Source Type: research