Japanese encephalitis is a mosquito-borne virus found throughout Asia. The first symptoms usually appear 5 to 10 days after the infecting bite. They typically include a fever, headaches, vomiting, confusion and moving difficulties. Seizures are common, especially among children.
Risk areas of Japanese encephalitis are present through most of East Asia. Countries with known risk include Burma, China, India, Indonesia, Japan, Laos, Malaysia, South Korea and Vietnam.