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Vaccination against hepatitis B in preschool children with Down's syndrome
P Vajro1, P Lettera, A Fontanella
1Department of Pediatrics, 2nd Faculty of Medicine, University of Naples, Italy.
Insights
Hepatitis B vaccination is effective in children with Down syndrome, demonstrating high antibody conversion rates. This finding supports routine immunization for this population, even with immune function differences.
Area of Science:
- Immunology
- Pediatrics
- Vaccinology
Background:
- Down syndrome is associated with immune function abnormalities.
- Hepatitis B virus (HBV) infection poses a risk to all populations.
- Effective vaccination strategies are crucial for vulnerable groups.
Purpose of the Study:
- To evaluate the efficacy of hepatitis B vaccination in children with Down syndrome.
- To assess antibody seroconversion rates following vaccination in this cohort.
- To determine if immune function differences impact vaccine response.
Main Methods:
- Twenty-nine children with Down syndrome, negative for hepatitis B surface antigen (HBsAg) and antibody (HBsAb), were enrolled.
- Participants received either a recombinant DNA or plasma-derived hepatitis B vaccine.
- Antibody levels (HBsAb) were monitored post-vaccination.
Main Results:
- Both vaccine types elicited a strong immune response.
- Hepatitis B antibody (HBsAb) seroconversion rates approached 100% in the vaccinated children.
- The vaccination was effective despite underlying immune function abnormalities.
Conclusions:
- Hepatitis B vaccination is highly effective in preschool children with Down syndrome.
- Routine vaccination can be successfully implemented in this population.
- The study confirms the safety and immunogenicity of hepatitis B vaccines in children with Down syndrome.
Abstract:
Twenty-nine healthy HBsAg- and HBsAb-negative children with Down's syndrome who were living at home (mean age 42 months; 19 M, 10 F) were vaccinated against hepatitis B virus either with recombinant DNA or plasma-derived vaccine. Both groups of children responded well to the vaccination schedules, with HBsAb seroconversion rates close to 100%. Vaccination against hepatitis B in preschool children with Down's syndrome is effective in spite of the existing abnormalities of the immune function.