สถาบันวิจัยวิทยาศาสตร์สาธารณสุข

National Institute of Health of Thailand

Occurrence of JE Encephalitis in 1999

Authors : Surapee Anantapreecha*, Atchareeya A-nuegoonpipat*, Areerat Sa-ngasang*, Nirandorn Panthuyosri*


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

Source:             Journal of Health Science 2002; 11(5): 708-713
 
Language:         Thai with English abstract
 
Abstract:
 
Japanese encephalitis is an infection of the central nervous system caused by Japanese encephalitis virus and it is mostly transmitted by Culex Tritaeniorhynchus. In 1999, there were 460 encephalitis cases reported and 270 specimens (58.7%), serum or CSF, were sent to Department of Medical Sciences for confirmation. Investigation of specific antibody to JE by ELISA and HI methods yielded 69 positive cases (25.5%) and 52 negative cases (19.3%). There were 149 unidentifiable cases (55.2%) because of inappropriate collection of the specimens. Most of encephalitis patients were reported in the northeast region while the number of positive JE cases were found in the north region. The highest numbers of encephalitis patients were reported in May, which correlated to the number of positive JE cases. The highest number of positive JE cases were found in the age groups of 1-4, 5-9, 10-14, 15-24 and >35 respectively.  More males were infected than females at the ratio of 2.1:1. The number of estimated JE patients in the year of 1999 was lower than in the year of 1997 and 1998 and it might be the result of the expansion of the JE vaccination program.