Journal
MEMORIAS DO INSTITUTO OSWALDO CRUZ
Volume 100, Issue 4, Pages 441-444Publisher
FUNDACO OSWALDO CRUZ
DOI: 10.1590/S0074-02762005000400017
Keywords
Aedes aegypti; pyrethroid resistance; knock down effect
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Resistance to cypermethrin of different Aedes aegypti Brazilian populations, collected at two successive periods (2001 and 200212003), 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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