Japanese encephalitis is an infection of the brain caused by a virus spread by the bite of a mosquito. It often causes fever and body aches, then progresses to infection of the brain. The infection is more common in rural areas, especially around pig farms.
Japanese encephalitis is prevented with a vaccine and by prevention of mosquito bites (see malaria prevention).
There is no treatment for Japanese encephalitis, only supportive care; therefore, vaccination is important.
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