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[Aedes aegypti resistance to temefos in counties of Ceará State].

Authors :
Lima EP
de Oliveira Filho AM
de Oliveira Lima JW
Ramos Júnior AN
de Góes Cavalcanti LP
Pontes RJ
Source :
Revista da Sociedade Brasileira de Medicina Tropical [Rev Soc Bras Med Trop] 2006 May-Jun; Vol. 39 (3), pp. 259-63.
Publication Year :
2006

Abstract

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 Ceará (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.

Details

Language :
Portuguese
ISSN :
0037-8682
Volume :
39
Issue :
3
Database :
MEDLINE
Journal :
Revista da Sociedade Brasileira de Medicina Tropical
Publication Type :
Academic Journal
Accession number :
16906249
Full Text :
https://doi.org/10.1590/s0037-86822006000300006