Japanese Encephalitis Vaccine

Japanese encephalitis is a mosquito-borne virus found throughout Asia. It is closely related to other infections like West Nile Virus. It is the most common cause of vaccine-preventable encephalitis in Asia. Travelers who are staying in regions with JE for an extended period of time should be vaccinated against the illness.

JE is a mosquito-borne disease, meaning it spreads through mosquito bites. A mosquito will usually spread the virus to pigs or birds, the virus cannot pass from human-to-human. Human-to-mosquito transmission is rare.

Travelers and residents should take extra precautions in the summer and fall. This time is when spread is most likely.

A Japanese encephalitis vaccination provides the best protection. Two doses given 28 days apart provide a more complete barrier against infection.

The vaccine is considered very safe by the CDC and other health organizations.

Yes, booster doses of the Japanese encephalitis vaccine are recommended for individuals who receive the first dose. Second doses are usually given within seven to 28 days and will provide protection for over a year. A third dose of the vaccine is given one year after the first dose and offers at least six-years protection.

Individuals between the ages of 18 and 65 qualify for an accelerated second dose booster at seven days instead of 28. Those outside the 18 to 65 age range will need to follow the 28 day booster guidance.

Vaccination is recommended for some types of travelers and individuals:

• Travelers to regions with active transmission
• Travelers to rural areas where infection could occur
• Travelers staying longer than one month
• Travelers engaging in certain activities that pose more risk

To learn if the vaccine is right for your trip, speak with a travel health specialist by calling 1-888-499-7277 or book an appointment online today!

Risk areas of Japanese encephalitis are present through most of East Asia. Countries with known risk include:

Source: CDC

• Myanmar (Burma)
• China
• India
• Indonesia
• Japan
• Laos
• Malaysia
• South Korea
• Vietnam

Any region of the Western Pacific with temperate climate and the presence of mosquitoes have the virus. This section’s map provides an idea of the highest risk areas.

Vaccination is required for some military and government personnel traveling to these regions. Be sure to check any requirements before your trip.

The majority of JE cases show no symptoms. It can take five to 15 days for symptoms to develop. Travelers may have returned home or is in the middle of a trip when it becomes serious.

Symptoms often start mild with fever, headache or vomiting. Over the next few days, there can be mental or neurological changes. Weakness and movement problems occur. Seizures are common, especially among children.

About 20 to 30 percent of those infected die. Between 30 and 50 percent of survivors have serious mental, neurological or cognitive problems. Paralysis similar to polio can also occur.

There is no treatment for Japanese encephalitis, only supportive care. This means an infected person can be made comfortable, but may not always recover.

Passport Health clinics throughout the country carry JE vaccine. Schedule your vaccination today by calling 1-888-499-7277 or book online now.