สถาบันวิจัยวิทยาศาสตร์สาธารณสุข

National Institute of Health of Thailand

Dengue Haemorrhagic fever incident and relation to Aedes survey in northeastern region

Authors : Chitti Chansang*,Supoon Paosriwong*, Usavadee Thavara*, U-ruyakorn Chansang*


Affiliations: 
       *National Institute of Health, Department of Medical Sciences

 

Source:               Communicable Disease Journal 2000; 26(2)         

 

Language:         Thai with English abstract

 

Abstract:

 

From monthly data of cases of Dengue Haemorrhagic fever (D.H.F) and rainfall in Prathai District Nakhon Ratchasima Province in northeastern region between 1991-1997, a pattern of D.H.F correlated with seasons. There were few cases in the cold and the warm season but there were many cases in the wet season. The regression equations of monthly data between D.H.F. cases (Y) and lagged 1 month of rainfall (X) was Y= 4.446+0.139X ,   R2 = 0.251. From 4 Aedes surveys, there were survey of visual larva, ovitrap, adult and pupa in this district in March (warm season), May-July (wet season) and September (cold season) in 1999. Data from survey of visual larva and pupa indicated that larva and pupa populations increased in the warm season and decreased in the wet season. And the data from survey of ovitrap and adult, egg and adult populations increased in the wet season. The important breeding place of Aedes aegypti were Jars and Cement tanks which produced 79.32% of pupae in these surveys. From these data, the recommendation for controlling Ae. Aegypti  were source reduction especially in Jar and Cement tank during January and February (cold season) before larva population might increase in the wet season. And this control should repeat in the wet season during March and April (warm season) for controlling adult population that might increase in the wet season. From this Aedes  control plane could be used effectively for D.H.F control plan in similar environment in northeastern region.