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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 104, No. 4, 2009, pp. 614-620
Bioline Code: oc09139
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 104, No. 4, 2009, pp. 614-620

 en Seasonal dynamics of Aedes aegypti check for this species in other resources (Diptera: Culicidae) in the northernmost state of Brazil: a likely port-of-entry for dengue virus 4
Codeço, Cláudia Torres; Honório, Nildimar Alves; Ríos-Velásquez, Cláudia M; dos Santos, Maria da Conceição Alves; de Mattos, Ingrid Vieira; Luz, Sérgio Bessa; Reis, Izabel Cristina; da Cunha, Guilherme Bernardino; Rosa-Freitas, Maria Goreti; Tsouris, Pantelis; de Castro, Márcia Gonçalves; Hayd, Ramão Luciano Nogueira & Luitgards-Moura, José Francisco

Abstract

Roraima is the northernmost state of Brazil, bordering both Venezuela and Guyana. Appropriate climate and vector conditions for dengue transmission together with its proximity to countries where all four dengue serotypes circulate make this state, particularly the capital Boa Vista, strategically important for dengue surveillance in Brazil. Nonetheless, few studies have addressed the population dynamics of Aedes aegypti check for this species in other resources in Boa Vista. In this study, we report temporal and spatial variations in Ae. aegypti population density using ovitraps in two highly populated neighbourhoods; Centro and Tancredo Neves. In three out of six surveys, Ae. aegypti was present in more than 80% of the sites visited. High presence levels of this mosquito suggest ubiquitous human exposure to the vector, at least during part of the year. The highest infestation rates occurred during the peak of the rainy seasons, but a large presence was also observed during the early dry season (although with more variation among years). Spatial distribution of positive houses changed from a sparse and local pattern to a very dense pattern during the dry-wet season transition. These results suggest that the risk of dengue transmission and the potential for the new serotype invasions are high for most of the year.

Keywords
Aedes aegypti - dengue fever - ovitraps - seasonality - Amazon

 
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