Japanese Encephalitis Vaccine

Japanese encephalitis is a disease spread through mosquito bites. Symptoms usually take 5-15 days to develop and include fever, headache, vomiting, confusion, and difficulty moving. Symptoms that develop later include swelling around the brain and coma. JE is a serious disease that may cause death.

Travelers who go to Asia are at risk for getting JE.


For most travelers the risk is extremely low but depends on where you are going, the time of year, your planned activities, and the length of the trip. You are at higher risk if you are traveling to rural areas, will be outside frequently, or will be traveling for a long period of time. In mild climates in northern Asia the risk for JE is greater in the summer and fall. In tropical and subtropical areas, there is a risk year-round.

There have been recent reports of JE even in travellers staying in resorts in Bali, and global warming may be affecting the seasonal incidence.

The number of doses and booster shots varies depending on the age you are first immunised, but typically anyone over 18 who receives JE vaccine offered at GSH will not need any further boosters.


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