[The factors associated with the occurrence of immature forms of Aedes aegypti in Ilha do Governador, Rio de Janeiro, Brazil].
Aedes aegypti is the vector of dengue, a disease that can result in epidemics. Ecological studies are important because different geographical populations of the vector may differ in their bioecological characteristics, which can be helpful in guiding control actions. The objective of this study was to identify and to analyze some factors associated with the occurrence of immature forms of A. aegypti on Ilha do Governador, Rio de Janeiro, using data from the National Health Foundation (FNS). The results showed that 58.04% of all the containers examined were supports for plant pots, and plastic or glass cans discarded in the yard. The highest percentages of positive breeding sites were observed in tires (1.41%), wells and cisterns (0.93%), and barrels and large metal cans (0.64%). In the summer, the proportion of positivity was higher for big containers used for water storage and for containers discarded in the yard. In the winter the proportion was higher for small containers used for water storage. The highest rates of positive containers were observed after three months without FNS activities. Our results show the necessity to continue the control, and suggest that less attention was paid to small containers during the winter by FNS. Factorial analysis showed that the determinant factor for the occurrence of immature forms of A. aegypti is represented by environmental factors, while elimination and treatment of breeding sites by FNS play a less important role, a fact possibly causing the maintenance of immature forms of A. aegypti.
Souza-Santos
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Departamento de Endemias Samuel Pessoa, Escola Nacional de Saúde Pública, Fundação Oswaldo Cruz, Rio de Janeiro, Brasil. rssantos@ensp.fiocruz.br
D000330:Aedes / Q000254:growth & development*; D000818:Animals; D001938:Brazil; D003715:Dengue / Q000517:prevention & control / Q000635:transmission; D017753:Ecosystem; D006801:Humans; D007303:Insect Vectors / Q000254:growth & development*; D007814:Larva / Q000254:growth & development; D008018:Life Cycle Stages; D009032:Mosquito Control; D011679:Pupa / Q000254:growth & development; D012621:Seasons; D014505:Urban Population