Winter refuge for Aedes aegypti and Ae. albopictus mosquitoes in Hanoi during winter
Autor(es): Tsunoda, Takashi; Tran Chi Cuong; Tran Duc Dong; Nguyen Thi Yen; Nguyen Hoang Le; Tran Vu Phong; Minakawa, Noboru
Resumo: Dengue occurs throughout the year in Hanoi, Vietnam, despite winter low temperatures < 10 degrees C. During July 2010 to March 2012, we surveyed monthly for Aedes larvae and pupae in 120 houses in 8 Hanoi districts. Aedes albopictus preferred discarded containers in summer and pupal density drastically decreased in winter. Aedes aegypti preferred concrete tanks and this preference increased in winter. Even in winter, the lowest water temperature found in concrete tanks was > 14 degrees C, exceeding the developmental zero point of Ae. aegypti. Although jars, drums and concrete tanks were the dominant containers previously (1994-97) in Hanoi, currently the percentage of residences with concrete tanks was still high while jars and drums were quite low. Our study showed that concrete tanks with broken lids allowing mosquitoes access were important winter refuge for Ae. aegypti. We also indicate a concern about concrete tanks serving as foci for Ae. aegypti to expand their distribution in cooler regions.
Palavras-Chave: Diptera-culicidae; Dengue vectors; Dispersal; Urbanization; Survival; Climate; Eggs
Imprenta: Plos One, v. 9, n. 4, 2014
Identificador do objeto digital: 10.1371/journal.pone.0095606
Descritores: Aedes aegypti - Epidemiology ; Aedes aegypti - Public health
Data de publicação: 2014
