Information on vaccination for Japanese encephalitis

Japanese encephalitis vaccination is a vaccination that prevents infection by using a dry cell culture Japanese encephalitis vaccine.
Since June 2009, the current Japanese encephalitis vaccine uses a dry cell culture Japanese encephalitis vaccine manufactured using Vero cells instead of mouse brain.

Important Notices

Due to the nationwide shortage of vaccine supply, individual notification of Japanese encephalitis 2nd stage will not be implemented in the 3rd year of Reiwa.

Due to manufacturing problems of Japanese encephalitis vaccine, there is a nationwide shortage of supply of Japanese encephalitis vaccine. In order to prioritize the inoculation of the first stage of Japanese encephalitis according to the instructions of the Ministry of Health, Labor and Welfare, we will not carry out individual notification of the second stage of Japanese encephalitis (sent just before the 9th birthday) in the 3rd year of Reiwa. Individual notifications will be given to the subjects in the 4th year of Reiwa, when the supply of Japanese encephalitis vaccine is expected to recover.

The vaccination period for those born between April 2, 1995 and October 1, 2009, who missed the opportunity to vaccinate against Japanese encephalitis, has been relaxed.

For those born on April 2, 1995 to April 1, 2007 who missed the vaccination opportunity, the shortage can be inoculated at public expense until the age of 20.
If you were born on April 2, 2007 to October 1, 2009 and have not been vaccinated the prescribed number of times during the period of the target age of the 1st term, during the period of the target age of the 2nd term (9) Uninoculated portion can be inoculated to (aged to under 13 years old).

As for the vaccination against Japanese encephalitis, we did not actively recommend Japanese encephalitis from 2005 to 2009 because there was a case of serious illness after vaccination. Since then, a new vaccine has been developed, and now you can get vaccinated against Japanese encephalitis as usual.

Link: Ministry of Health, Labor and Welfare website(Link to external site)(Open in a new window)

Symptoms of Japanese encephalitis

It is caused by infection with Japanese encephalitis virus. The virus that has increased in pigs, not directly from humans, is transmitted and transmitted by Culex tritaenior.
The incubation period is 7 to 10 days, resulting in acute encephalitis with symptoms such as high fever, headache, vomiting, impaired consciousness and convulsions. In addition to encephalitis, some people end up with meningitis and summer cold-like symptoms. The mortality rate when suffering from encephalitis is about 20-40%, but many people have neurological sequelae. Recently, about 10 people occur annually, mainly among the elderly in western Japan.

Effect of vaccination

Immunity in the body can prevent and alleviate the symptoms of Japanese encephalitis infection, which is distributed throughout Japan except for some areas such as Hokkaido.
It is said that it is desirable to inoculate twice for the first time (with an interval of 6 to 28 days) and once for the additional inoculation (after the completion of the first two inoculations, approximately one year later). After completing the 1st term 3 times, a booster vaccination will be given as the 2nd term.

About side reactions

Within 3 days after inoculation, 18.7% of fever, 11.4% of cough, 9.8% of runny nose, and 8.9% of redness and swelling at the inoculation site are observed.

Inoculation time

	Standard inoculation age	Inoculation age	Inoculation method	remarks
1st term first time	First inoculation 3 years old 6 months or more in special case	6 months to less than 90 months after birth	Inoculate twice at intervals of 6 to 28 days.	Inoculate all of the items on the left to terminate basal immunity.
1st term added	Additional inoculation 4 years old	6 months to less than 90 months after birth (about 1 year after the first inoculation of the 1st term)	Inoculate once.
2nd term	4th grade	9-12 years old	Inoculate once.	Booster vaccination for those who have completed basal immunity.

Inoculation cost

free.

Belongings

Maternal and Child Health Handbook
Address, age, name can be confirmed (health insurance card, etc.)
Vaccination number sticker (only for those who are eligible for the 1st term. Those who have already put it on the pre-examination slip are not required)
Vaccination number printed pre-examination slip (only for 2nd term subjects)

* You can download the pre-examination slips for the 1st stage target (A) and the treatment vaccination target (C) from the following. In addition, for those who are subject to the second stage (B) and have lost the vaccination slip with the vaccination number printed on it, or for those of age who do not receive the vaccination slip with the vaccination number printed on it, the vaccination slip Can be downloaded from the following.

1st stage pre-examination slip (for infants) : Download the 1st stage initial vaccination
, 1st stage booster vaccination, and under 3 years old　pre-examination slip (Japanese encephalitis under 3 years old) for those 6 months to less than 90 months old (PDF: 256KB)

　　　　・Download the pre-examination slip for 3 years old and over　(Japanese encephalitis 3 years old and over) (PDF: 256KB)

B. 2nd stage pre-examination slip (for elementary school children) … Download the 2nd stage inoculation pre-examination slip (Japanese encephalitis 2nd stage) for those aged 9 to 13 years old
(PDF: 326KB)

   C. Measures vaccination pre-examination slip … For
                                  those born between April 2, 1995-April 1, 2007, April 2, 2007-October 1, 2009 , the shortage of vaccination
                              pre-examination slip Download (Japanese Brain Measures) (PDF: 342KB)

(C.’s pre-examination slip has two pages, one on the front and one on the back. You can print on both sides or on one side, but there are columns on both sides, so be sure to print both pages. )

* If you do not have the pre-examination slip, please use the one available at the city cooperating medical institution. You can also find it at the Infectious Disease Control Division of the Health Center and the Health Division of each ward Health and Welfare Center, or you can download it from the link above.

* Vaccination must be accompanied by a guardian. A power of attorney (PDF: 105KB) is required if someone other than a guardian is to take it .

* Please see here if you would like to have the pre-examination slip mailed .

Precautions for inoculation

As a general rule, vaccinations should be given on a good day. If your child is not in good health, consult your doctor before deciding whether or not to inoculate.
In addition, you cannot be vaccinated in the following cases.

If you have a clear fever (usually above 37.5 degrees)
When it is clear that you have a serious acute illness
If you have had anaphylaxis due to the components of the vaccination solution you should receive
If you have a disease with apparently abnormal immune function or if you are receiving treatment that causes immunosuppression
In addition, when the doctor determines that the condition is inappropriate

General precautions after vaccination

Observe your child at a medical institution or get in touch with your doctor for 30 minutes after vaccination. Sudden side reactions may occur during this time.
Watch out for side reactions for a week after inoculation.
Keep the inoculation site clean. You can take a bath, but do not rub the inoculation site.
Avoid strenuous exercise on the day of inoculation.
If you experience any abnormal reactions or changes in your physical condition at the site of inoculation after inoculation, see a doctor immediately.

Inoculation medical institution

You can receive it at the vaccination cooperation medical institution designated by Chiba City.

Cooperating medical institutions have a link to the list in “Implementation method” of ” Information on routine immunization “.

* Reservations must be made by phone to a medical institution in advance.

About health damage relief system by vaccination

If a serious side reaction caused by routine vaccination causes health problems such as medical treatment or leaving a disability that interferes with your life, the Immunization Law You can get compensation based on.
There are categories of medical expenses, medical allowances, child-rearing pensions for children with disabilities, disability pensions, lump-sum death allowances, and funeral fees according to the degree of health damage, and the amount stipulated by law is paid. Except for the lump-sum death allowance and funeral fee, payment will be made until the treatment is completed or the disability is healed.
However, the causal relationship between the health hazard caused by vaccination or another factor (infectious disease that was mixed in before or after vaccination or another cause, etc.) is determined by vaccination / infectious disease. After deliberation by a national examination committee consisting of experts in various fields such as medical care and law, y