Japanese Encephalitis
A mosquito-borne virus found mainly in parts of Asia and the western Pacific.
Symptoms and what to notice
Most infections have no symptoms; severe disease can cause fever, headache, vomiting, confusion, seizures, weakness, or coma.
How long can it last?
Symptoms generally begin five to 15 days after infection; neurologic recovery can take months and may be incomplete.
How serious is Japanese Encephalitis?
Encephalitis is rare but can be fatal or leave permanent neurologic disability.
Treatment and management
No specific antiviral treatment; severe disease requires hospital supportive care.
Is there a vaccine—and who should receive it?
IXIARO is a two-dose U.S. vaccine for eligible travelers and laboratory workers. Dose spacing is age-dependent; complete the series at least one week before travel.
Official U.S. guidance
Read the current CDC guidance for Japanese Encephalitis →
Cost: Patient cost varies by insurance, provider, location, and eligibility. Many recommended vaccines are covered with no out-of-pocket cost under qualifying plans, and eligible children may receive vaccines through the Vaccines for Children program. CDC price lists are purchasing benchmarks—not guaranteed patient prices. CDC price context.