Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system
Mem. Inst. Oswaldo Cruz
; 103(1): 50-59, Feb. 2008. graf, mapas
Article
in English
| LILACS
| ID: lil-478877
Responsible library:
BR1.1
ABSTRACT
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 percent (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.
Full text:
Available
Collection:
International databases
Health context:
SDG3 - Health and Well-Being
/
Neglected Diseases
/
SDG3 - Target 3.3 End transmission of communicable diseases
Health problem:
Target 3.3: End transmission of communicable diseases
/
Dengue
/
Dengue
Database:
LILACS
Main subject:
Ovum
/
Mosquito Control
/
Aedes
/
Insect Vectors
Type of study:
Screening study
Limits:
Animals
Language:
English
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
Tropical Medicine
/
Parasitology
Year:
2008
Document type:
Article
/
Project document
Affiliation country:
Brazil
Institution/Affiliation country:
Fiocruz/BR
/
Instituto Nacional de Pesquisas Espaciais/BR
/
Secretaria Municipal de Saúde/BR
/
Universidade Federal do Paraná/BR