Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system

Memórias do Instituto Oswaldo Cruz

Lêda Regis¹  Antonio Miguel Monteiro²  Maria Alice Varjal De Melo-santos¹  José Constantino Silveira Jr¹  André Freire Furtado¹  Ridelane Veiga Acioli¹  Gleice Maria Santos¹  Mitsue Nakazawa¹  Marilia Sá Carvalho¹  Paulo Justiniano Ribeiro Jr¹  Wayner Vieira De Souza¹ 

[1] ,Instituto Nacional de Pesquisas EspaciaisSão José dos Campos SP ,Brasil

关键词: dengue vector;    population densities;    ovitraps;    Bti;    vector control;    Recife;   

DOI  :  10.1590/S0074-02762008000100008

来源: SciELO

【 摘 要 】

A new approach to dengue vector surveillance based on permanent egg-collection using a modified ovitrap and Bacillus thuringiensis israelensis(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 (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.

【 授权许可】

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