Hesperian Health Guides

Japanese Encephalitis

Japanese encephalitis is spread by the Culex mosquito. These mosquitoes are medium-sized, brown, and have whitish markings on the abdomen. They usually bite at dusk and after dark. By day, they rest in and around homes and other structures and near plants and vegetation. Japanese encephalitis mostly affects people in Asia and the western Pacific. Most people do not become seriously ill, however severe cases of Japanese encephalitis can damage the brain and even cause death.

Signs of Japanese encephalitis

A person with Japanese encephalitis may have no signs or may only have signs shared with many other illnesses, such as fever, diarrhea, vomiting, headache, or weakness.

Treatment can help you feel better. But take a person with any danger signs to a hospital quickly.

Danger signs of severe Japanese encephalitis
  • Seizures
  • Paralysis (being unable to move)
  • Becomes unconscious

Vaccination prevents Japanese encephalitis. Also avoid mosquito bites and prevent mosquitoes from breeding.

This page was updated:25 Nov 2019