
Explanation of vaccination Japanese Encephalitis　日本脳炎 Illness to prevent Japanese encephalitis Japanese encephalitis is caused by Japanese encephalitis virus. The virus lives in the pig’s body and is transmitted to human by a kind of mosquito, culex tritaeniorhyncus. Japanese encephalitis is endemic in the western region of Japan, and the Southeast Asia. Symptoms may be high fever, headaches, vomiting, convulsions, and acute encephalitis. This illness has a high death rate and often results in permanent damage to the nervous system. Type of vaccine Inactivated vaccine Routine Vaccination (age and frequency) Period I: after the 3rd birthday; 2 shots, 1-to 4-week (6 -28 days) apart 1 additional shot, 1 year later. Period II: 1 shot, for the 4th-year elementary school students. Side effects Side effects may be mild fever, swelling at the injection site, and rash. Rarely, ADEM (acute disseminated encephalomyelitis) may occur. ※ADEM (Acute Disseminated Encephalomyelitis) It is a disease of brain, and usually follows a viral infection. Symptoms are fever, headache, convulsion, and ataxia etc. As mouse brains are used in producing Japanese encephalitis vaccines, it may have a causal link with ADEM. Minimum interval between vaccinations over 6 days ＊As side effects have been reported, this vaccination is no longer actively recommended since June 2005. But it is available for those who want it.

Explanation of vaccination

Japanese Encephalitis　日本脳炎

Illness to prevent

Japanese encephalitis
Japanese encephalitis is caused by Japanese encephalitis virus. The virus lives in the pig’s body and is transmitted to human by a kind of mosquito, culex tritaeniorhyncus. Japanese encephalitis is endemic in the western region of Japan, and the Southeast Asia.
Symptoms may be high fever, headaches, vomiting, convulsions, and acute encephalitis. This illness has a high death rate and often results in permanent damage to the nervous system.

Type of vaccine

Inactivated vaccine

Routine Vaccination (age and frequency)

Period I: after the 3rd birthday; 2 shots, 1-to 4-week (6 -28 days) apart
1 additional shot, 1 year later.
Period II: 1 shot, for the 4th-year elementary school students.

Side effects

Side effects may be mild fever, swelling at the injection site, and rash.
Rarely, ADEM (acute disseminated encephalomyelitis) may occur.
※ADEM (Acute Disseminated Encephalomyelitis)
It is a disease of brain, and usually follows a viral infection. Symptoms are fever, headache, convulsion, and ataxia etc.
As mouse brains are used in producing Japanese encephalitis vaccines, it may have a causal link with ADEM.

Minimum interval between vaccinations

over 6 days

＊As side effects have been reported, this vaccination is no longer actively recommended since June 2005. But it is available for those who want it.