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 carr...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Fundação Oswaldo Cruz (FIOCRUZ)
2008-02-01
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| Series: | Memorias do Instituto Oswaldo Cruz |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762008000100008 |
| _version_ | 1797756886517284864 |
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| author | Lêda Regis Antonio Miguel Monteiro Maria Alice Varjal de Melo-Santos José Constantino Silveira Jr André Freire Furtado Ridelane Veiga Acioli Gleice Maria Santos Mitsue Nakazawa Marilia Sá Carvalho Paulo Justiniano Ribeiro Jr Wayner Vieira de Souza |
| author_facet | Lêda Regis Antonio Miguel Monteiro Maria Alice Varjal de Melo-Santos José Constantino Silveira Jr André Freire Furtado Ridelane Veiga Acioli Gleice Maria Santos Mitsue Nakazawa Marilia Sá Carvalho Paulo Justiniano Ribeiro Jr Wayner Vieira de Souza |
| author_sort | Lêda Regis |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-12T18:07:00Z |
| format | Article |
| id | doaj.art-0c552e46da8b4ab88c2d5487c8778f22 |
| institution | Directory Open Access Journal |
| issn | 0074-0276 1678-8060 |
| language | English |
| last_indexed | 2024-03-12T18:07:00Z |
| publishDate | 2008-02-01 |
| publisher | Fundação Oswaldo Cruz (FIOCRUZ) |
| record_format | Article |
| series | Memorias do Instituto Oswaldo Cruz |
| spelling | doaj.art-0c552e46da8b4ab88c2d5487c8778f222023-08-02T09:25:56ZengFundação Oswaldo Cruz (FIOCRUZ)Memorias do Instituto Oswaldo Cruz0074-02761678-80602008-02-011031505910.1590/S0074-02762008000100008Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control systemLêda RegisAntonio Miguel MonteiroMaria Alice Varjal de Melo-SantosJosé Constantino Silveira JrAndré Freire FurtadoRidelane Veiga AcioliGleice Maria SantosMitsue NakazawaMarilia Sá CarvalhoPaulo Justiniano Ribeiro JrWayner Vieira de SouzaA 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762008000100008dengue vectorpopulation densitiesovitrapsBtivector controlRecife |
| spellingShingle | Lêda Regis Antonio Miguel Monteiro Maria Alice Varjal de Melo-Santos José Constantino Silveira Jr André Freire Furtado Ridelane Veiga Acioli Gleice Maria Santos Mitsue Nakazawa Marilia Sá Carvalho Paulo Justiniano Ribeiro Jr Wayner Vieira de Souza Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system Memorias do Instituto Oswaldo Cruz dengue vector population densities ovitraps Bti vector control Recife |
| title | Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system |
| title_full | Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system |
| title_fullStr | Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system |
| title_full_unstemmed | Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system |
| title_short | Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system |
| title_sort | developing new approaches for detecting and preventing aedes aegypti population outbreaks basis for surveillance alert and control system |
| topic | dengue vector population densities ovitraps Bti vector control Recife |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762008000100008 |
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