title: [Aedes aegypti resistance to temefos in counties of Ceará State].
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.
authors.affiliation: Departamento de Saúde Comunitária, Universidade Federal do Ceará, Rua Prof. Costa Mendes 1608/5o andar, Rodolfo Teófilo, 60430-140 Fortaleza, CE.
authors.forename: Estelita Pereira
authors.initials: EP
authors.lastname: Lima
authors.forename: Alfredo Martins
authors.initials: AM
authors.lastname: de Oliveira Filho
authors.forename: José Wellington
authors.initials: JW
authors.lastname: de Oliveira Lima
authors.forename: Alberto Novaes
authors.initials: AN
authors.lastname: Ramos Júnior
authors.forename: Luciano Pamplona
authors.initials: LP
authors.lastname: de Góes Cavalcanti
authors.forename: Ricardo José Soares
authors.initials: RJ
authors.lastname: Pontes
mesh_terms: D000330:Aedes / Q000187:drug effects*; D000818:Animals; D001938:Brazil; D007303:Insect Vectors / Q000187:drug effects*; D007305:Insecticide Resistance; D007306:Insecticides; D007814:Larva / Q000187:drug effects; D000002:Temefos
chemical_list: D007306:Insecticides; D000002:Temefos