Aedes Aegypti Larval Survey Vector and Analysis Risk Area for Dengue Hemorrhagic Fever

要旨

Dengue Hemorrhagic Fever (DHF) is a major health problem in Thailand. The primary vector is the mosquito Aedes aegypti. Causes of the disease pandemic are including lack of a better understanding of local people in DHF surveillance and control, poor water supply and waste water management. The purposes of this research were to investigate existing larval vector households in the study area, and to apply geographic information systems (GIS) for dengue hemorrhagic fever risk area identification during three outbreak periods (pre seasonal, seasonal, and post seasonal). The dengue vector indices (HI, CI, BI) of visual larval were employed for existing larval households identification. The larvae were mostly found in usable water containers in all 3 periods. The dengue vector indices (HI, CI, and BI) were higher than normal value in seasonal outbreaks. The dengue hemorrhagic fever risk area identification using GIS program showed the boundary of breeding area of Aedes aegypti within 30 and 60 meters. The Aedes aegypti larva was distributed covering all area. The highest risk of DHF transmission was found in seasonal outbreaks and still remains high in post seasonal outbreaks. GIS is an alternative method to predict the breeding location of dengue mosquito and DHF and apply for decision supporting system, surveillance, and epidemiological control of DHF.