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Mem Inst Oswaldo Cruz. 2005 Jul;100(4):441-4. Epub 2005 Aug 17.

Monitoring of resistance to the pyrethroid cypermethrin in Brazilian Aedes aegypti (Diptera: Culicidae) populations collected between 2001 and 2003.

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  • 1Departamento de Entomologia, Instituto Oswaldo Cruz, Fiocruz, 21045-900 Rio de Janeiro, RJ, Brazil.


Resistance to cypermethrin of different Aedes aegypti Brazilian populations, collected at two successive periods (2001 and 2002/2003), was monitored using the insecticide-coated bottles bioassay. Slight modifications were included in the method to discriminate between mortality and the knock down effect. Although this pyrethroid was recently started to be used in the country to control the dengue vector, a decrease in susceptibility was noted between both periods analyzed, particularly in the city of Rio de Janeiro. The results indicate that resistance is due at least in part to a target site alteration.

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