Seasonal dynamics of Aedes aegypti (Diptera: Culicidae) in the northernmost state of Brazil: a likely port-of-entry for dengue virus 4

Memórias do Instituto Oswaldo Cruz

Cláudia Torres Codeço²  Nildimar Alves Honório¹  Cláudia M Ríos-velásquez¹  Maria Da Conceição Alves Dos Santos¹  Ingrid Vieira De Mattos¹  Sérgio Bessa Luz¹  Izabel Cristina Reis¹  Guilherme Bernardino Da Cunha¹  Maria Goreti Rosa-freitas¹  Pantelis Tsouris¹  Márcia Gonçalves De Castro¹  Ramão Luciano Nogueira Hayd¹  José Francisco Luitgards-moura¹ 

[1] ,Fiocruz Programa de Computação Científica

关键词: Aedes aegypti;    dengue fever;    ovitraps;    seasonality;    Amazon;   

DOI  :  10.1590/S0074-02762009000400014

来源: SciELO

【 摘 要 】

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 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.

【 授权许可】

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