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About Vaccinations Japanese Encephalitis

Final update date April 12, 2021

Japanese Encephalitis Vaccine Shipment

The Osaka University Research Institute for Microbial Diseases has temporarily stopped producing vaccines for Japanese Encephalitis Vaccines. Vaccines are being adjusted to be shipped to cooperating medical institutions for vaccinations.
For this reason, we give priority to the first and second vaccinations in the first phase and those who are approaching the deadline for routine immunization.
Specifically, please see "about shipment adjustment of Japanese Encephalitis vaccine (PDF: 133KB)".

 About supply situation of vaccine (outside site) (outside site) (Ministry of Health, Labor and Welfare)

What is Japanese Encephalitis

It is caused by infection with Japanese Encephalitis virus infection. Viruses that have increased in the body, such as pigs, not directly from humans, are caused by mosquitoes.
It is transmitted and infected.
After an incubation period of 7 to 10 days, you will have acute encephalitis with symptoms such as high fever, headache, vomiting, impaired consciousness, and convulsions.
The epidemic in Japan is mainly in western Japan, but the virus is distributed throughout Japan.
The trend of Japanese Encephalitis epidemic in breeding pigs lasts from June to October every year, but during this time, depending on the region,
About 80% of pigs are infected.
Previously, it occurred in children and schoolchild, but decreased due to spread of Vaccinations decreased, and has not been vaccinated recently.
Patients are occurring mainly in the elderly.
Overseas, epidemics are currently occurring in South Asia and Southeast Asia, including India.
The majority of infections end asymptomatic, but one in 100 to 1000 people develops encephalitis.
If it occurs, the mortality rate of the patient is 20-40%, and 45-70% of the people who survive will have sequelae such as paralysis.


Using dry cell culture Japanese Encephalitis dry cell culture is used to inoculate as follows.

[Standard Schedule] (1st term: 6 months to less than 90 months after birth / 2nd term: 9 years to under 13 years old)

(1) After inoculating the first term (1), inoculate the first term (2) at intervals of 6 to 28 days.
(2) After inoculation of "first term (2)", we inoculate "one additional term" approximately one year later.
(3) After "addition of the first term" inoculation, we inoculate "the second term" approximately five years later.

 Relief System

[Free period]
First vaccination: 6 months to 7 and a half years old (until the day before 7 years and 6 months)

Phase 2 vaccination: 9 years old and under 13 years old (until the day before the 13th birthday)

side reaction of vaccine

General side effects such as fever, swelling and pain at the site of inoculation have been reported.
Very rare side effects include shock, anaphylaxis, acute sporadic encephalomyelitis (ADEM),
Encephalitis / encephalopathy, convulsions, acute thrombocytopenic purpura have been reported.

※The incidence of ADEM and encephalitis / encephalopathy is not unique to Japanese Encephalitis vaccines.
The causes of these developments may be after the onset of an infectious disease, after vaccination with other vaccines, or otherwise.

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Inquiries to this page

Yokohama Vaccinations Call Center

Telephone: 045-330-8561

Telephone: 045-330-8561

Fax: 045-664-7296

Email address: [email protected]

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