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Dominance of Aedes aegypti over Aedes albopictus in the southeastern coast of Brazil Dominancia de Aedes aegypti sobre Aedes albopictus no litoral sudeste do Brasil



Dominance of Aedes aegypti over Aedes albopictus in the southeastern coast of Brazil Dominancia de Aedes aegypti sobre Aedes albopictus no litoral sudeste do Brasil



Revista de Saude Publica. Dezembro; 376: 729-734



Objective: To assess infestation of Aedes aegypti and Aedes albopiticus and describe their association with weather conditions and container colonization in urban areas. Methods: The town of Sao Sebastiao in the southeastern coast of Brazil was selected. It was used data from the Dengue and Yellow Fever Vector Control Program of the State of Sao Paulo, Brazil, that encompasses entomological surveillance at strategic positions, traps and foci demarcation. Strategic positions sites are fixed sites with containers in adequate conditions for larvae growth. Statistical analysis was performed using Kruskal-Wallis test, Dwass-Steel-Chritchlow-Fligne test and Mann-Whitney test. Results: There was found an annual growth of positive traps and strategic positions of Ae. aegypti and a drop in Ae. albopictus population. An increase in immature Ae. aegypti and a drop of the other species were also seen. A gradual increase of positive dwellings for Ae. aegypti was noticed outgrowing Ae. albopictus population. There was a weak correlation of the Aedes species with abiotic factors. Higher numbers of immature mosquitoes of both species were found in artificial containers which could be eliminated. Conclusions: The study showed Ae. aegypti was predominant in urban areas, indicating that its growth seems to have affected the coexistence with other species. Natural selection could be in place contributing to Aedes aegypti and albopictus species separation.

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