Autor(es): Diallo, M; Ba, Y; Sall, AA; Diop, OM; Ndione, JA; Mondo, M; Girault, L; Mathiot, C

Resumo: After 8 years of silence, dengue virus serotype 2 (DENV-2) reemerged in southeastern Senegal in 1999. Sixty-four DENV-2 strains were isolated in 1999 and 9 strains in 2000 from mosquitoes captured in the forest gallery and surrounding villages. Isolates were obtained from previously described vectors, Aedes furcifer, Ae. taylori, Ae. luteocephalus, and-for the first time in Senegal-from Ae. aegypti and Ae. vittatus. A retrospective analysis of sylvatic DENV-2 outbreaks in Senegal during the last 28 years of entomologic investigations shows that amplifications are periodic, with intervening, silent intervals of 5-8 years. No correlation was found between sylvatic DENV-2 emergence and rainfall amount. For sylvatic DENV-2 vectors, rainfall seems to particularly affect virus amplification that occurs at the end of the rainy season, from October to November. Data obtained from investigation of preimaginal (i.e., nonadult) mosquitoes suggest a secondary transmission cycle involving mosquitoes other than those identified previously as vectors.

Palavras-Chave: Trans - Ovarial transmission; Rift - Valley fever; Southeastern senegal; Aedes aegypti; Yellow fever; Mosquitos; Arboviruses; Antibodies; Culicidae; Diptera

Imprenta: Emerging Infectious Diseases, v. 9, n. 3, p. 362-367, 2003

Identificador do objeto digital: 10.3201/eid0903.020219

Descritores: Aedes aegypti - Dengue ; Aedes aegypti - Epidemiology ; Aedes aegypti - Public health

Data de publicação: 2003

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