Aedes aegypti resistance to temefos in counties of Ceara State
Autor(es): Lima, Estelita Pereira; de Oliveira Filho, Alfredo Martins; de Oliveira Lima, Jose Wellington; Ramos Junior, Alberto Novaes; de Ges Cavalcanti, Luciano Pamplona; Soares Pontes, Ricardo Jose
Resumo: The susceptibility of Aedes aegypti to temefos was evaluated by means of samples of eggs and larvae from four large counties in the State of Ceara (Fortaleza, Barbalha, Juazeiro do Norte and Crato). The technique standardized by the World Health Organization for tests with larvicides was used. The CL50 of eight samples from populations of Aedes was determined, as were their respective resistance ratios, compared to the CL50 of the susceptible Rockefeller strain. All populations submitted to the experiment showed resistance to temefos, with resistance ratios varying between 8 and 16 Analysis of these results reinforces prior evidence regarding the dissemination of temefos resistance in different locations in the state, subjected to considerable pressure for control in recent decades. The larvicide may lose its effectiveness if an urgent attempt is not made to reestablish the susceptibility of Aedes aegypti in these areas, profoundly affecting control campaigns currently under way.
Palavras-Chave: Aedes aegypti; Control of vectors; Temefos; Resistance to insecticides
Imprenta: Revista da Sociedade Brasileira de Medicina Tropical, v. 39, n. 3, p. 259-263, 2006
Identificador do objeto digital: 10.1590/S0037-86822006000300006
Descritores: Aedes aegypti - Larvicide
Data de publicação: 2006
