This is a single-arm, non-randomized, open-label post-marketing safety observation study. The purpose of this study is to investigate the safety of JEV-I given with primary immunization in a large amount of healthy children aged 8 months and older.

Healthy children aged 8 months and older who choose to receive the study vaccine for primary immunization at their own expense in Jiangsu Province will be invited to participate in this study. No study vaccine will be supplied or administered as part of this study, participants will be monitored following vaccine administration in clinical settings.

The primary immunization program with JEV-I requires 2 intramuscular doses administered 7-10 days apart. All participants will be observed for the incidence of any adverse events (AEs) within 30 minutes and from 30 minutes to 7 days after each vaccination, including local and systemic reactions. Additionally, all participants will be observed for unsolicited AEs within 30 days after after each vaccination.

Inclusion Criteria:

• Healthy children who have received the inactivated Japanese encephalitis vaccine.
• Legal guardian of the participants voluntarily participates in the clinical trial and signs an informed consent form.
• Legal guardian of the subject has the ability to understand the procedures of the study and accept all scheduled visits.

Exclusion Criteria:

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Healthy children aged 8 months and older who voluntarily receive the research vaccines within Jiangsu Province