Skip to Content
Home > Health Information > Health Library > Japanese Encephalitis Vaccine: What You Need to Know
Japanese encephalitis (JE) is a serious infection caused by the Japanese encephalitis virus.
JE vaccine can help protect travelers from JE disease.
Japanese encephalitis vaccine is approved for people 2 months of age and older. It is recommended for travelers to Asia who:
Laboratory workers at risk for exposure to JE virus should also be vaccinated.
The vaccine is given as a 2-dose series, with the doses spaced 28 days apart. The second dose should be given at least a week before travel. Children younger than 3 years of age get a smaller dose than patients who are 3 or older.
A booster dose might be recommended for anyone 17 or older who was vaccinated more than a year ago and is still at risk of exposure. There is no information yet on the need for a booster dose for children.
NOTE: The best way to prevent JE is to avoid mosquito bites. Your doctor can advise you.
Tell your doctor if you have any severe allergies that you know of.
If you will be traveling for fewer than 30 days, especially if you will be staying in urban areas, tell your doctor. You might not need the vaccine.
With a vaccine, like any medicine, there is a chance of side effects. When side effects happen, they are usually mild and go away on their own.
The safety of vaccines is always being monitored. For more information, visit www.cdc.gov/vaccinesafety.
VAERS is only for reporting reactions. They do not give medical advice.
Vaccine Information Statement
Japanese Encephalitis Vaccine
Department of Health and Human Services
Centers for Disease Control and Prevention
Many Vaccine Information Statements are available in Spanish and other languages. See www.immunize.org/vis.
Muchas hojas de información sobre vacunas están disponibles en español y en otros idiomas. Visite www.immunize.org/vis.
Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Our interactive Decision Points guide you through making key health decisions by combining medical information with your personal information.
You'll find Decision Points to help you answer questions about:
Get started learning more about your health!
Our Interactive Tools can help you make smart decisions for a healthier life. You'll find personal calculators and tools for health and fitness, lifestyle checkups, and pregnancy.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.
See important information from Billings Clinic on Non-discrimination and Interpreter Services.
Billings Clinic is proud to be an equal opportunity/affirmative action (EOE/AA) e-verify employer.