A reemergência do dengue no Brasil é resultante da recente reinfestação do país pelo mosquito Aedes (Stegomyia) aegypti Linnaeus, 1762 (Diptera: Culicidae), principal transmissor do dengue e também responsável pela transmissão da febre amarela urbana 3 9. Minas Gerais está entre os estados com maior incidência de dengue e a Cidade de Uberlândia contribui significativamente com estes números 4 . A luta antivetorial tem sido a principal estratégia de controle desta doença tanto no Brasil, quanto nos demais países atingidos por esta arbovirose.Embora a biologia deste mosquito seja razoavelmente bem conhecida, peculiaridades regionais e locais relacionadas ao clima e às modificações do ambiente feitas pelo ser humano interferem na dinâmica populacional do mosquito ao longo do ano. Assim, o conhecimento dessas particularidades é fundamental para a aplicação de medidas de controle mais efetivas regional e localmente.Coletas com auxílio de armadilhas de oviposição (ovitrampas) apresentam alta sensibilidade, permitem detectar a presença e estimar a abundância relativa deste díptero, adequando-se para uso em estudos em campo e na vigilância vetorial deste culicídeo
ABSTRACTAspects of the population dynamics of Aedes aegypti were investigated from collections over a two-year period in the urban area of Uberlândia, State of Minas Gerais. The population dynamics of this mosquito were influenced by physical factors such as temperature and rainfall. High larval densities also had an influence on mosquito development.
Systematic assessments of control measures against the jigger flea Tunga penetrans are scarce, and there are no published data available on the efficacy of environmental insecticides against immature stages. We tested four environmental contact insecticides used by Brazilian authorities for disease control (deltamethrin, bifenthrin, dichlorvos and etofenprox) against T. penetrans eggs. Eggs were reared in vitro. Hatch rates were observed under standardized conditions and compared to a control group (40 eggs in each group). No larvae hatched after treatment with the organophosphate dichlorvos (100% efficacy). The efficacies of the other products tested varied between 17% and 57%. The data show that the organophosphate dichlorvos had a good in vitro efficacy. The use of dichlorvos can be directed to typical spots where early stages of T. penetrans are expected, considering its toxicity. Disease control should also consist of prevention measures concerning housing and environmental conditions, veterinary and human health measures.
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