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A reduced dose approach to hepatitis B vaccination for low-risk newborns and preschool children
Insights
A study compared two doses of the hepatitis B vaccine (B-Hepavac II) in newborns and young children. Both 2.5 and 5 microgram doses showed comparable effectiveness, though newborns had lower response rates than older children.
Area of Science:
- Immunology
- Vaccinology
- Pediatrics
Background:
- Hepatitis B vaccination is crucial for preventing infection.
- Determining optimal vaccine dosage in different age groups is essential for public health.
Purpose of the Study:
- To compare the immunogenicity of 2.5 mcg versus 5 mcg of hepatitis B vaccine (B-Hepavac II).
- To evaluate vaccine effectiveness in low-risk neonates and preschool children aged 3-8 years.
Main Methods:
- A comparative study involving 587 neonates and 777 preschool children.
- Vaccine administration at 0, 1, and 3 months, with serology testing at 4 and 12 months post-vaccination.
Main Results:
- Seroconversion rates were comparable between 2.5 mcg and 5 mcg groups (newborns: 93.5% vs 95.7%; children: 97.4% vs 98.7%).
- Newborns showed significantly lower seroconversion rates in the 2.5 mcg group when using a titre > 10 IU/L.
- Older children achieved higher seroconversion rates and geometric mean titres (GMT) than newborns, irrespective of dose.
Conclusions:
- The 2.5 mcg dose of B-Hepavac II is comparable to the 5 mcg dose in most recipients.
- Age is a significant factor influencing hepatitis B vaccine response, with older children responding better than neonates.
Abstract:
The effectiveness of a 2.5 micrograms dose of the hepatitis B vaccine (B-Hepavac II) was compared with that of 5 micrograms in 587 low-risk neonates and 777 preschool children of age 3-8 years. The vaccines were administered at months 0, 1 and 3, with postvaccination serology tested at months 4 and 12. The seroconversion rates of the 2.5 microgram recipients (newborn: 93.5%; preschool children: 97.4%) are comparable with the 5 micrograms group (newborn: 95.7%; preschool children: 98.7%). The seroconversion rates of the newborns are, however, significantly lower in the 2.5 micrograms group if positive response is taken as a titre > 10 IU l-1, instead of > 0 IU l-1. The older children, on the other hand, achieved a higher seroconversion rate and geometric mean titre (GMT) when compared with the newborns. irrespective of the dose received.