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Japanese encephalitis in mainland china
Huanyu Wang1, Yixing Li, Xiaofeng Liang
1Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China.
Japanese Journal of Infectious Diseases
|September 19, 2009
Summary
Japanese encephalitis (JE) is a seasonal epidemic affecting children, primarily in summer months across China. Widespread vaccination has drastically reduced JE cases since 1971.
Area of Science:
- Epidemiology
- Infectious Diseases
- Public Health
Background:
- Japanese encephalitis (JE) is a significant seasonal epidemic in China with a 50-year history.
- JE exhibits distinct epidemiological patterns including seasonality, sporadic occurrence, and a predilection for children under 15.
- The disease is endemic nationwide, with notable exceptions in specific provinces.
Purpose of the Study:
- To summarize the key epidemiological characteristics of Japanese encephalitis in China.
- To highlight the impact of vaccination on JE incidence over time.
Main Methods:
- Retrospective analysis of historical JE case data in China.
- Description of epidemiological features: seasonality, geographical distribution, age groups affected, and transmission patterns.
Main Results:
- Approximately 90% of JE cases occur between July and September, with earlier peaks in Southern China.
- JE cases are typically sporadic, with rare familial clusters.
- Nationwide JE morbidity decreased from 174,932 cases in 1971 to 5,097 in 2005, attributed to vaccine implementation.
Conclusions:
- Japanese encephalitis in China demonstrates clear seasonal and geographical patterns, predominantly affecting young individuals.
- The widespread use of the JE vaccine has been highly effective in reducing the overall burden of the disease.
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