A serological study of Japanese encephalitis virus infections in northern Peninsular Malaysia
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M J Cardosa1, B H Choo, I Zuraini
1School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang.
Abstract:
This study describes the status of viral encephalitis in Perak, Malaysia during the year 1990. In addition, 14 cases selected from Penang and Perak during the years 1989 and 1990 are presented, with data showing titers of neutralizing antibodies against Japanese encephalitis virus (JEV) and dengue 2 virus, titers of antibodies against JEV and dengue virus antigens as determined by DEIA, and a comparison of these with the presence of IgM to JEV and dengue virus. These data show that there probably is far more viral encephalitis due to JEV in Malaysia than the national figures reflect.
Insights
Viral encephalitis cases in Malaysia, particularly Japanese encephalitis virus (JEV) infections, are likely underreported. This study analyzed antibody data from 1989-1990, revealing higher JEV prevalence than national figures suggest.
Area of Science:
- Epidemiology
- Virology
- Public Health
Background:
- Viral encephalitis poses a significant public health challenge in Malaysia.
- Accurate diagnosis and reporting are crucial for understanding disease burden and implementing control measures.
Purpose of the Study:
- To describe the status of viral encephalitis in Perak, Malaysia in 1990.
- To investigate the role of Japanese encephalitis virus (JEV) and dengue virus in encephalitis cases in Penang and Perak between 1989 and 1990.
- To compare antibody titers and IgM presence for JEV and dengue virus to assess etiological contributions.
Main Methods:
- Retrospective analysis of 14 encephalitis cases from Penang and Perak (1989-1990).
- Measurement of neutralizing antibody titers against JEV and dengue 2 virus.
- Detection of antibodies against JEV and dengue virus antigens using Dengue Enzyme Immunoassay (DEIA).
- Assessment of IgM antibody presence for JEV and dengue virus.
Main Results:
- Serological data indicated significant antibody responses to JEV and dengue virus in the studied cases.
- Comparison of antibody titers and IgM levels suggested a substantial contribution of JEV to viral encephalitis.
- The findings imply that national surveillance data may underestimate the true incidence of JEV encephalitis in Malaysia.
Conclusions:
- Japanese encephalitis virus (JEV) is a likely significant cause of viral encephalitis in Malaysia.
- Current national reporting may not fully capture the burden of JEV infections.
- Further epidemiological studies are warranted to confirm the extent of JEV encephalitis in the region.