Autor(es): Maestre S., R.; Rey V., G.; De Las Salas A., J.; Vergara S., C.; Santacoloma V., L.; Goenaga O., S.; Carrasquilla F., M. C.

Resumo: Dengue fever is endemic to the department of Atlantico; in 2007, there were 3,104 cases reported. The larvicide temephos has been used for the prevention and control of the disease. However, it is unknown if the selective pressure exerted on Aedes aegypti populations by this insecticide has generated resistance. The susceptibility of A. aegypti larvae to temephos was evaluated in seven municipalities and one county of the department of Atlantico between 2007 and 2008. Bioassays were performed using diagnostic doses of temephos (0.012 ppm) on third and early fourth Instar larvae of A. aegypti (F2), following a methodology recommended by the World Health Organization. Two repetitions were conducted, each one with four replicates and control. Susceptibility to temephos was registered for two sites (mortality rate 100%), four sites require verification for surveillance (mortality rates between 86 - 93%), and two showed resistance (mortality rates 34 - 45%). Significant differences were found in the mortality rates among populations (Kruskal-Wallis, P < 0.05). It is necessary to monitor the populations of this vector in the department of Atlantico to generate the baseline for susceptibility that will allow the implementation of preventive strategies and alternative control methods pertinent to each site, in order to reduce the selective pressure on larvae posed by the use of this larvicide.Original Abstract: La fiebre de dengue es endemica para el departamento del Atlantico; en 2007 se presentaron 3,104 casos. Para la prevencion y control de esta enfermedad se ha usado el larvicida temefos. Sin embargo, se desconoce si la presion a la que han sido sometidas las poblaciones de Aedes aegypti con este insecticida ha generado resistencia. Se evaluo la susceptibilidad a temefos en larvas de A. aegypti en siete municipios y un corregimiento del departamento del Atlantico, entre el 2007 y el 2008. Se realizaron bioensayos utilizando la concentration diagnostica para temefos (0,012 ppm) en larvas de tercer y cuarto estadio temprano de A. aegypti (F2) aplicando la metodologia recomendada por la Organizacion Mundial de la Salud (OMS). Se realizaron dos repeticiones, cada una con cuatro replicas y un control. En dos localidades se registro susceptibilidad al temefos (mortalidad de 100%), en cuatro se requiere verification para vigilancia (mortalidades entre 86% - 93%) y en dos se presento resistencia (mortalidad de 34% y 45%). Se encontraron diferencias significativas en los porcentajes de mortalidad entre las poblaciones (Kruskal-Wallis, P < 0.05). Es necesario monitorear las poblaciones de este vector en el departamento del Atlantico con el fin de generar la linea base de susceptibilidad que permita implementar estrategias preventivas y metodos alteraativos de control pertinentes a cada localidad para disminuir la presion de seleccion a la que estan sometidas las larvas por la aplicacion de este larvicida.

Palavras-Chave: Dengue fever; Epidemics; Disease prevention; Disease control; Mosquitoes; Biological assays; Insecticides

Imprenta: Revista Colombiana de Entomologia, v. 35, n. 2, p. 202-205, 2009.

Descritores: Aedes aegypti - Transmission ; Aedes aegypti - Larvicide ; Aedes aegypti - Dengue ; Aedes aegypti - Public health

Data de publicação: 2009

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