Infestation of Aedes aegypti estimated by oviposition traps in Brazil.
OBJECTIVE
To assess infestation levels of Aedes aegypti using the oviposition trap (ovitrap) method and to compare these results with data obtained with the use of indices traditionally applied in public programs aimed at fighting this vector.


METHODS
Nine sentinel areas in Northeastern, Brazil, were assessed and infestation levels were measured for a nine-month period. Egg density and container indices were estimated and compared with previous results found using the house index and Breteau index.


RESULTS
The results indicated that the area studied was infested with this vector during the entire study period and that the infestation was widespread in all areas. Different results were found with the different indices studied. There were areas in which the house index and the Breteau index were negative or close to zero, whereas the container index for the same area was 11% and the egg density index was 8.3%.


CONCLUSIONS
The container and egg density indices allow better assessment of infestation rates in a city than the conventionally used indices (house index and Breteau index). At lower operational costs and easier standardization, these indices can be applied as a measurement tool for assessing infestation rates during entomological surveillance in programs to fight Aedes aegypti.
Morato
Vanêssa C G
VC
Instituto de Saúde Coletiva, Universidade Federal da Bahia, Salvador, BA, Brasil. vmorato@ig.com.br
Teixeira
Maria da Glória
Mda G
Gomes
Almério C
AC
Bergamaschi
Denise P
DP
Barreto
Maurício L
ML
D000330:Aedes / Q000502:physiology; D000818:Animals; D001938:Brazil; D003715:Dengue / Q000635:transmission*; D004197:Disease Reservoirs; D005260:Female; D006798:Housing; D006801:Humans; D007303:Insect Vectors / Q000502:physiology; D009032:Mosquito Control / Q000379:methods*; D010058:Oviposition; D011156:Population Density; D018570:Risk Assessment; D018571:Sentinel Surveillance