Katsuda, YoshioLeemingsawat, SomjaiThongrungkiat, SupatraPrummonkol, SamrengSamung, YudthanaKanzaki, TsutomuWatanabe, TomoeKahara, Tomoko2009-05-272009-05-272008-03-21Katsuda Y, Leemingsawat S, Thongrungkiat S, Prummonkol S, Samung Y, Kanzaki T, Watanabe T, Kahara T. Control of mosquito vectors of tropical infectious diseases: (2) pyrethroid susceptibility of Aedes aegypti ( l) collected from different sites in Thailand. The Southeast Asian Journal of Tropical Medicine and Public Health. 2008 Mar; 39(2): 229-34http://imsear.searo.who.int/handle/123456789/30608The Southeast Asian Journal of Tropical Medicine and Public Health.Four strains (SS, BS, A and B) of Aedes aegypti collected from different sites in Bangkok and at different times were examined for their pyrethroid susceptibility. Mosquito coils containing dl, d-T80-allethrin, d, d-T-prallethrin and methoxymethyl-tetrafluorobenzyl tetramethyl-cyclopropanecarboxylate (K-3050) with or without a synergist were tested by the 25 m3 semi-field test method. One strain (SS) was the most susceptible with KT50 values of about < 30 minutes for all mosquito coils, while the other three strains (BS, A and B) were found to be around 10 to 20 times more tolerant to pyrethroids than the SS strain. A similar tendency for the pyrethroid susceptibility of the four strains was obtained with tests by topical application method. In field efficacy tests, mosquito coils with d, d-T-prallethrin 0.20% plus N-(2-ethylhexyl)bicycle-[2,2,1]- hept-5- ene-2,3-dicarboxyimide as a synergist exhibited a repellent effect of about 85%, while those with K-3050 0.10% plus the synergist exhibited a greater repellent effect of about 90%. In contrast, the repellent effect of commercial dl, d-T80-allethrin 0.20% coils was as low as about 50%. The d, d-T-prallethrin and K-3050 coils with the synergist were confirmed to be highly effective in repelling Ae. aegypti.engAedes --drug effectsAllethrin --pharmacologyAnimalsDrug ResistanceInsect Repellents --pharmacologyInsect Vectors --drug effectsPesticide Synergists --pharmacologyPyrethrins --chemistryThailandJournal Article