Surveillance of Japanese encephalitis
Learn about Japanese encephalitis surveillance.
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How many cases of Japanese encephalitis are there?
In 2012, the World Health Organization estimated 67,900 Japanese encephalitis cases annually.
Largely as a result of immunization, the incidence of Japanese encephalitis has been declining in:
- Japan
- Nepal
- Vietnam
- Thailand
- Sri Lanka
- the Republic of Korea
- some regions of China
However, transmission of the virus remains unaffected by immunization, and non-immunized individuals remain at risk.
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