Abstract
The aim of the present study was to verify the coexistence between Aedes aegypti and Aedes albopictus populations in municipalities of the States of Paraná and Santa Catarina with different urbanization profiles where dengue occurs and evaluate their susceptibility to the organophosphate temephos. The number of eggs per ovitrap were counted and incubated for hatching to identify the species. Data analysis of the populations was conducted to determine randomness and aggregation, using the variance-to-mean ratio (index of dispersion). Susceptibility to temephos was evaluated by estimation of the resistance ratios RR50 and RR95. Aedes aegypti samples were compared with the population Rockefeller and Aedes albopictus samples were compared with a population from the State of Santa Catarina and with the Rockefeller population. Coexistence between Aedes aegypti and Aedes albopictus and the aggregation of their eggs were observed at all the sites analyzed in the State of Paraná. All the Aedes aegypti populations from the State of Parana showed alteration in susceptibility status to the organophosphate temephos, revealing incipient resistance. Similarly, all the Aedes albopictus populations (States of Paraná and Santa Catarina) presented survival when exposed to the organophosphate temephos.
Highlights
The aim of the present study was to verify the coexistence between Aedes aegypti and Aedes albopictus populations in municipalities of the States of Paraná and Santa Catarina with different urbanization profiles where dengue occurs and evaluate their susceptibility to the organophosphate temephos
Coexistence of Ae. aegypti and Ae. albopictus was observed in all the municipalities studied in the State of Paraná, similar to that observed by Gomes et al[26] and Fantinatti et al[27]
There is no official record of the dengue virus transmission by Ae. albopictus in Brazil
Summary
The aim of the present study was to verify the coexistence between Aedes aegypti and Aedes albopictus populations in municipalities of the States of Paraná and Santa Catarina with different urbanization profiles where dengue occurs and evaluate their susceptibility to the organophosphate temephos. The occurrence of dengue fever epidemics is directly related to the presence and density of vectors, when viral circulation occurs These mosquito species can often coexist in artificial containers in urban and periurban localities[4]. Immature Ae. albopictus may inhabit natural containers, such as bromeliads, bamboo and holes in the tree trunks[5] This plasticity of Ae. albopictus to colonize artificial containers and natural breeding sites and to coexist with other species in urban and periurban localities can increase its dispersion to new areas where control is impaired. Arbovirus circulation may cause the emergence of diseases within this ecological system[6]
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