The Study of Dengue Vector Distribution in Taiwan from 2009 to 2011

This study was a part of dengue vector surveillance from 2009 to 2011 conducted by requesting local health bureau to submit at least 100 Aedes larvae or pupae for species identification to understand the distribution of dengue vectors in Taiwan. Additionally, 2 locations each in low and high sea level were also included each year from northern, central, southern, and eastern Taiwan for larval and adult survey. A total of 1,105,408 mosquito larvae or pupae and 9,667 non-mosquitoes were identified, which collected from 7,141 villages, 365 townships, and 22 counties/cities. Among the 77,470 found of Ae. aegypti, these were existed only in Tainan, Kaohsiung, Pingtung, Taitung, and Penghu. Compared to the previous surveys on 1988-1996 and 2003-2004, the distribution of this species was decreased in 31 townships and increased in 6 townships, including Gaoshu Township, Pingtung County; Nanhua, Baihe, and Danei Districts, Tainan City; and Wangan and Xiyu Townships, Penghu County. Among the 735,235 found of Ae. albopictus, these occurred in all surveyed townships except Juguang Township, Lienchiang County with the sea level up to 1,760 m.