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

2009; Instituto Oswaldo Cruz, Ministério da Saúde; Volume: 104; Issue: 4 Linguagem: Inglês

10.1590/s0074-02762009000400014

1678-8060

Cláudia Torres Codeço, Nildimar Alves Honório, Claudia María Ríos-Velásquez, Maria da Conceição Alves dos Santos, Ingrid Vieira de Mattos, Sérgio Bessa Luz, Izabel Cristina dos Reis, Guilherme Bernardino da Cunha, María Goreti Rosa-Freitas, Pantelis Tsouris, María G. Castro, Ramão Luciano Nogueira Hayd, José Francisco Luitgards-Moura,

Zoonotic diseases and public health

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.