ABSTRACT
The Culicidae composition of the Barra Grande Lake situated between the municipalities of Esmeralda (Rio Grande do Sul State) and Anita Garibaldi (Santa Catarina State) was assessed by monthly samplings. Twenty-four species were identified from a total of 1,185 specimens (74.7% as adults and 25.3% as immatures), with Aedes fluviatilis Lutz as the most frequent species. Several species are new records, and some of them are of public health interest. It is suggested that local environmental changes may alter the relationship between humans and vector mosquitoes.
Subject(s)
Culicidae , Animals , Brazil , Fresh Water , Population DensityABSTRACT
A composição de Culicidae do lago de Barra Grande, situado entre os municípios de Esmeralda (Rio Grande do Sul) e Anita Garibaldi (Santa Catarina), foi realizada com coletas mensais. Vinte e quatro espécies foram identificadas dentre um total de 1.185 espécimes (74,7 por cento adultos e 25,3 por cento imaturos), sendo Aedes fluviatilis Lutz a espécie mais frequente. Algumas espécies constituem novos registros e são interesse em saúde pública. O fato sugere que mudanças ambientais na área podem alterar a relação entre humanos e mosquitos vetores.
The Culicidae composition of the Barra Grande Lake situated between the municipalities of Esmeralda (Rio Grande do Sul State) and Anita Garibaldi (Santa Catarina State) was assessed by monthly samplings. Twenty-four species were identified from a total of 1,185 specimens (74.7 percent as adults and 25.3 percent as immatures), with Aedes fluviatilis Lutz as the most frequent species. Several species are new records, and some of them are of public health interest. It is suggested that local environmental changes may alter the relationship between humans and vector mosquitoes.
Subject(s)
Animals , Culicidae , Brazil , Fresh Water , Population DensityABSTRACT
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.
Subject(s)
Aedes , Dengue/transmission , Insect Vectors , Mosquito Control/methods , Aedes/physiology , Animals , Brazil , Disease Reservoirs , Female , Housing , Humans , Insect Vectors/physiology , Oviposition , Population Density , Risk Assessment , Sentinel SurveillanceABSTRACT
OBJETIVO: Estimar os índices de infestação do Aedes aegypti, utilizando ovitrampa com atrativo e comparar esse método com os tradicionalmente utilizados nos programas oficiais de combate ao vetor. MÉTODOS: Foram analisadas nove áreas sentinelas de Salvador, Estado da Bahia, durante nove meses. Foram calculados os índices de densidade de ovos e positividade de ovitrampa, e levantamento dos índices de infestação predial e de Breteau para comparação. RESULTADOS: Observou-se que o município apresentou infestação pelo vetor durante todo o período de estudo em todas as áreas sentinelas. Os índices nem sempre apresentaram resultados de infestação semelhantes. Em algumas áreas os índices de infestação predial e de Breteau foram negativos ou próximos de zero, enquanto que o índice de positividade de ovitrampa apresentou valor de 11 for cent e o índice de densidade de ovos 8,3 for cent. CONCLUSÕES: O índice de positividade de ovitrampa e o índice de densidade de ovos permitem avaliar melhor o quadro de infestação de uma cidade com custo operacional bastante reduzido e com maior facilidade de padronização do que os índices tradicionais (infestação predial e de Breteau). Recomenda-se, assim, sua utilização nas fases de levantamento de índices e de vigilância entomológica desenvolvidas pelo programa de combate ao Aedes aegypti.