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Japanese Encephalitis Vaccine: What You Need to Know

Why get vaccinated?

Japanese encephalitis (JE) vaccine can prevent Japanese encephalitis.

JE vaccine

Japanese encephalitis vaccine is approved for people 2 months of age and older.

It is recommended for people who:

It should also be considered for travelers spending less than one month in a country where JE occurs, if they:

Many laboratory workers at risk for exposure to JE virus will also require vaccination.

The vaccine is given as a 2-dose series. A booster dose is recommended after a year for people who remain at risk.

NOTE: The best way to prevent JE is to avoid mosquito bites. Your health care provider can advise you.

Talk with your health care provider

Tell your vaccine provider if the person getting the vaccine:

In some cases, your health care provider may decide to postpone JE vaccination to a future visit.

People with minor illnesses, such as a cold, may be vaccinated. People who are moderately or severely ill should usually wait until they recover before getting JE vaccine.

Your health care provider can give you more information.

Risks of a vaccine reaction

Studies have shown that severe reactions to JE vaccine are very rare.

People sometimes faint after medical procedures, including vaccination. Tell your provider if you feel dizzy or have vision changes or ringing in the ears.

As with any medicine, there is a very remote chance of a vaccine causing a severe allergic reaction, other serious injury, or death.

What if there is a serious problem?

An allergic reaction could occur after the vaccinated person leaves the clinic. If you see signs of a severe allergic reaction (hives, swelling of the face and throat, difficulty breathing, a fast heartbeat, dizziness, or weakness), call 9-1-1 and get the person to the nearest hospital.

For other signs that concern you, call your health care provider.

Adverse reactions should be reported to the Vaccine Adverse Event Reporting System (VAERS). Your health care provider will usually file this report, or you can do it yourself. Visit the VAERS website at or call 1-800-822-7967. VAERS is only for reporting reactions, and VAERS staff do not give medical advice.

How can I learn more?

Vaccine Information Statement

Japanese Encephalitis Vaccine


42 U.S.C. § 300aa-26

Department of Health and Human Services

Centers for Disease Control and Prevention

Many Vaccine Information Statements are available in Spanish and other languages. See

Muchas hojas de información sobre vacunas están disponibles en español y en otros idiomas. Visite

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