Japanese encephalitis

An infection found in Asia and the West Pacific that can cause brain swelling.


Japanese encephalitis is a viral infection spread by the bite of infected mosquitoes. It's more common in rural and agricultural areas.


Most cases are mild. Rarely, the infection causes serious brain swelling with a sudden headache, high fever and disorientation.


Treatment involves supportive care. A vaccine is available.

© 1998-2023 Mayo Foundation for Medical Education and Research (MFMER). All rights reserved. | Terms of Use