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.
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Last modified on: 8 September 2017
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