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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 103, No. 1, 2008, pp. 50-59
Bioline Code: oc08008
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 103, No. 1, 2008, pp. 50-59

 en Developing new approaches for detecting and preventing Aedes aegypti check for this species in other resources population outbreaks: basis for surveillance, alert and control system
Regis, Lêda; Monteiro, Antonio Miguel; de Melo-Santos, Maria Alice Varjal; Silveira Jr., José Constantino; Furtado, André Freire; Acioli, Ridelane Veiga; Santos, Gleice Maria; Nakazawa, Mitsue; Carvalho, Marilia Sá; Ribeiro Jr., Paulo Justiniano & de Souza, Wayner Vieira


A new approach to dengue vector surveillance based on permanent egg-collection using a modified ovitrap and Bacillus thuringiensis israelensis check for this species in other resources (Bti) was evaluated in different urban landscapes in Recife, Northeast Brazil. From April 2004 to April 2005, 13 egg-collection cycles of four weeks were carried out. Geo-referenced ovitraps containing grass infusion, Bti and three paddles were placed at fixed sampling stations distributed over five selected sites. Continuous egg-collections yielded more than four million eggs laid into 464 sentinel-ovitraps over one year. The overall positive ovitrap index was 98.5% (over 5,616 trap observations). The egg density index ranged from 100 to 2,500 eggs per trap-cycle, indicating a wide spread and high density of Aedes aegypti check for this species in other resources (Diptera: Culicidae) breeding populations in all sites. Fluctuations in population density over time were observed, particularly a marked increase from January on, or later, according to site. Massive egg-collection carried out at one of the sites prevented such a population outbreak. At intra-site level, egg counts made it possible to identify spots where the vector population is consistently concentrated over the time, pinpointing areas that should be considered high priority for control activities. The results indicate that these could be promising strategies for detecting and preventing Ae. aegypti population outbreaks.

dengue vector - population densities - ovitraps - Bti - vector control - Recife

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