สถาบันวิจัยวิทยาศาสตร์สาธารณสุข

National Institute of Health of Thailand

Population fluctuation of some mosquitoes in the waste water treatment lagoon and mangrove areas at Tambon Laem Phak Bia, Ban Laem District, Petchaburi Province

Authors : Nipa Benjaphong*, Uruyakorn Chansang*, Thamrong Ponchevin*, Sunaina Sathantripob*, Amnart Boonkroupun*

 

Affiliations:         * Division of Medical Entomology, Department of Medical sciences, Nonthaburi 11000, Thailand
 
Source:            Journal of Health Science 2003; 12(2): 285-295

Abstract:         
 Thai with English abstract
 
At present, garbage and polluted water are environmental problem that affect humans especially they provide breeding places for disease-carrying mosquitoes. The Medical Entomology Section carried out a survey study on species composition, density, and population fluctuation of some mosquito vectors; Aedes aegypti larvae population; and the risk of contracting dengue haemorrhagic fever (DHF) in the water treatment lagoon and the mangrove area. This project was a part of the Laem Phak Bia Research and Environment Development Project of His Majesty the King’s Initiative, Tambon Laem Phak Bia, Ban Laem district, Petchaburi province. This mosquito survey was conducted between January-December 1999 using 10 light traps in 5 locations, from 6:00PM till 6:00AM. The results showed that the collected 6,418 mosquitoes comprised 7 genera 27 species. Twelve species were completely characterized. Population densities of Culex tritaeniorhynchus  (Japanese encephalitis vector whose occurrence peaked in September), Culex gelidus (Japanese encephalitis vector), Aedes aegypti (DHF-Dengue haemorrhagic fever-vector), and Mansonia sp. (Filariasis vector) were 33.7, 0.1, 0.02 and 0.03 percent, respectively. The survey of DHF vector larvae during April-November revealed a high Breteau Index (BI) value of over 200 each month. The average BI value was 209.38 ± 0.0173, which indicated that local people faced a potential risk of contracting DHF.