Seasonal dynamics of Aedes aegypti (Diptera: Culicidae) in the northernmost state of Brazil: a likely port-of-entry for dengue virus 4
Mem. Inst. Oswaldo Cruz
;
104(4): 614-620, July 2009. ilus, graf, mapas
Article
in English
| LILACS
| ID: lil-523729
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 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 percent 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.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Seasons
/
Aedes
/
Dengue
/
Dengue Virus
/
Insect Vectors
Type of study:
Etiology study
/
Risk factors
/
Screening study
Limits:
Animals
/
Humans
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
Tropical Medicine
/
Parasitology
Year:
2009
Type:
Article
/
Project document
Affiliation country:
Brazil
/
Greece
Institution/Affiliation country:
Fiocruz/BR
/
Freitas & Tsouris Consultants/GR
/
Instituto Nacional de Pesquisas Espaciais/BR
/
Universidade Federal de Roraima/BR
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