สถาบันวิจัยวิทยาศาสตร์สาธารณสุข

NATIONAL INSTITUTE OF HEALTH OF THAILAND

Laboratory surveillance on japanese encephalitis in Thailand, 1993-1998

Authors : Chantanee Buranachai*, Areerat Sa-ngasang*, Sumalee Nuangplee*, Nirandorn Punyosri*, Surapee Anantaprecha*, Paijit Warachit*

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

                        Ministry of Public Health.

 

Source:             Journal of Health Sciences 2000; 9(3): 342-348

 

Language:         Thai with English abstract

 

Abstract

 

This retrospecitive study was to summarize a situation of Japanese encephalitis (JE) in Thailand during 1993-1998 based on a laboratory surveillance system. Specimens, serums and CSF, from patients were examined for JE antibody by standard hemaglutination inhibition, MA-and GAG-ELISA assays. Interpretation of their results was based on WHO criteria. During 1993-1998 there were 500-700 reported excephalitis cases per year (mean = 597). Specimens of only 274 cases per year on the average were sent to the Department of Medical Science, for serological confirmation and about 34 cases per year were found serologically positive for JE. In 1998, 71 cases were confirmed, setting the highest record for the past 6 years. The incidence of encephalitis was high in the Northern and the Northeast of Thailand while the JE comfirmed cases were the highest in the North and the Central. Specifically Chiangmai province reported the highest number of encephalitis cases (249) while Suphanburi province had the most confirmed JE cases (32). In all, the incidence of JE in the country was obviously on a decline. However, the confirmed JE cases and the specimens increased in 1998.