Assessment of immune responses to hepatitis A vaccination in children aged 1 and 2 years

Results: Nine percent of the children were seropositive for anti-HAV IgG before vaccination. The seroconversion rate at 2 weeks was 34% and 44% in Group 1 and Group 2, respectively. At 4 weeks the seroconversion rate was 87.7% and 90.1% in Group 1 and Group 2, respectively. All of the children who completed the vaccination program were seropositive at 28 weeks (after the second dose). No serious adverse reaction was observed in any of the children. Conclusion: It was determined that Avaxim, including 80 antigen units, is safe and immunogenic in healthy children 12 and 24 months of age.