Is the Japanese encephalitis (JEV) vaccine attenuated or inactivated?

JEV refers to the Japanese encephalitis vaccine, which comes in two types: live attenuated vaccine and inactivated vaccine. The details are as follows:

1. Live attenuated vaccine

The Japanese encephalitis live attenuated vaccine is classified as a Category I vaccine and has low toxicity. The first dose is administered as basic immunization when an infant reaches 8 months of age, and a booster dose (the second dose) is required at 2 years of age.

2. Inactivated vaccine

A total of four doses of the Japanese encephalitis inactivated vaccine are required. Two doses should be given within 8 months of age, with an interval of 7–10 days between them. One additional dose is needed at 2 years of age and another at 6 years of age, to ensure sufficient immunity so that even if infected, the individual will not develop the disease.

It is recommended to choose the appropriate vaccine based on the child's specific situation under the guidance of a qualified physician. If any adverse reactions occur after vaccination, prompt medical attention is necessary.