Surveillance of Aedes aegypti susceptibility to insecticides
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Abstract
The susceptibility of Aedes aegypti in eight provinces of the northeastern part of Thailand to 0.05% deltamethrin, 0.15% cyfluthrin, 0.75% permethrin and 5% malathion in the year 2005 was compared with the data in 2001-2002. The susceptibility test method followed the World Health Organization standard method. The results showed that Ae. aegypti in the urban areas were moderate to high susceptible to deltamethrin, cyfluthrin and malathion. The mortality rate was 81-100%. In comparison with the data in 2001-2002, the susceptibility to deltamethrin increased while those to malathion decreased. Ae. aegypti in all studied areas showed the lowest susceptibility to permethrin. Different groups of insecticides should be used in vector control in order to prevent the rapid development of resistance caused by the continuation use of any single insecticide. It is also necessary to monitor the susceptibility of Ae. aegypti to different insecticides being used in different areas of the country. This information is necessary for the appropriate management of vector control in different areas.
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