Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system
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 car...
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Veröffentlicht in: | Memórias do Instituto Oswaldo Cruz 2008-02, Vol.103 (1), p.50-59 |
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Zusammenfassung: | 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. |
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ISSN: | 1678-8060 0074-0276 0074-0276 1678-8060 |
DOI: | 10.1590/s0074-02762008000100008 |