Monitoring JE Antibody Levels in Healthy Populations and Immunization Strategy in Low-Prevalence Areas

Inclusion Criteria: * Permanent residents aged 6 years (inclusive) and older; * Healthy individuals as determined clinically after inquiring about medical history and conducting relevant physical examinations; * Individuals who meet the vaccination criteria for the inactivated Japanese encephalitis vaccine (Vero cells); * Participants must provide informed consent to receive vaccination and blood c collection; minors must obtain informed consent from their guardians; * Participants planned to be included in Group A must have previously completed the full vaccination schedule for the Japanese encephalitis vaccine (including live attenuated vaccine or inactivated vaccine). Exclusion Criteria: * Participants are unwilling to sign the informed consent form; * History of allergy to the vaccine or its components, severe adverse reactions to the vaccine such as allergies, urticaria, breathing difficulties, angioedema, or abdominal pain; * Individuals with encephalopathy, uncontrolled epilepsy, and other progressive neurological diseases; * History of seizures or convulsions, or family history of psychiatric disorders; * Presence of congenital malformations or developmental disorders, genetic defects, and severe malnutrition; * Individuals with autoimmune diseases, congenital or acquired immunodeficiencies, or family history of autoimmune diseases or immunodeficiencies; * Any acute diseases or acute exacerbations of chronic diseases in the past 7 days; * Treatment with immunosuppr…