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Am. J. Trop. Med. Hyg., 77(2), 2007, pp. 303-309
Copyright © 2007 by The American Society of Tropical Medicine and Hygiene

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Low Gene Flow of Aedes aegypti between Dengue-Endemic and Dengue-Free Areas in Southeastern and Southern Brazil

Magda Clara Vieira da Costa-Ribeiro, Ricardo Lourenço-de-Oliveira*, AND Anna-Bella Failloux
Laboratório de Transmissores de Hematozoários, Instituto Oswaldo Cruz, Rio de Janeiro, Brazil; Insectes et Maladies Infectieuses, Institut Pasteur, Paris, France

We present a population genetic study of Aedes aegypti in Brazil using isoenzyme markers. Four polymorphic loci were used to examine 11 mosquito collections at four periods in 2003. Samples from a dengue-endemic area (southeastern region) and a dengue-free area (southern region) connected by an important network of roads and railways were analyzed. The degree of genetic differentiation observed between populations is consistent with limited gene flow between them. There was no evidence of passive dispersion of Ae. aegypti by vehicles among the different routes linking metropolitan areas.

Received April 5, 2006. Accepted for publication March 6, 2007.

Acknowledgments: We are grateful to Helder Ricas Rezende, Gleidson Magno Esperança, Luis Fernando de Souza Figueredo, Gisela Marques, Marcelo Carvalho Rezende, Celso dos Anjos, Maria Angélica Weber, Wellington C. Silva, Carlos Guedes, Waldecir Ribeiro Vieira, and Josué Mauricio Ferreira for providing mosquito samples; Nadia Ayad and Andiaria Ramos da Silva for technical assistance; Sara Moutailler and Marcia Castro for assistance in the laboratory; the Geoprocessamento DIS-CICT/FIOCRUZ Laboratory for assistance; and Heloisa Maria Nogueira Diniz for preparing the figures.

Financial support: This study was supported by the Pasteur Institute in Paris, Conselho Nacional de Desenvolvimento Científico e Tecnológico and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brazil.

* Address correspondence to Ricardo Lourenço de Oliveira, Laboratório de Transmissores de Hematozoários, Instituto Oswaldo Cruz-Fiocruz, Avenida Brasil 4365, 21045-900-Rio de Janeiro, RJ, Brazil. E-mail: lourenco{at}ioc.fiocruz.br

Authors’ addresses: Magda Clara Vieira da Costa-Ribeiro and Ricardo Lourenço-de-Oliveira, Laboratório de Transmissores de Hematozoários, Instituto Oswaldo Cruz-Fiocruz, Avenida Brasil, 4365, 21045-900-Rio de Janeiro, RJ, Brazil. Anna-Bella Failloux, Unité Génétique Moléculaire des Bunyaviridés, Institut Pasteur, 25–28 rue du Docteur Roux, 75724 Paris Cedex 15, France.






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