Immunogenic effect of hepatitis B vaccine in children: comparison of two- and three-dose protocols

Area of Science:

• Immunology
• Vaccinology
• Pediatrics

Background:

• Hepatitis B remains a significant global health concern, particularly in infants.
• Effective infant vaccination is crucial for preventing chronic infection and long-term complications.
• Optimizing infant vaccination schedules can improve public health outcomes.

Purpose of the Study:

• To evaluate and compare the immunogenicity of two different dosing schedules for a 5-microgram hepatitis B vaccine in infants.
• To determine if a two-dose regimen is as effective as a three-dose regimen in eliciting an immune response.

Main Methods:

• A study involving 183 hepatitis B surface antigen-negative infants in Senegal.
• Infants were randomized into two groups: one receiving two 5-microgram doses (2-month interval) and the other three 5-microgram doses (1-month intervals).
• All infants received a booster dose one year after the primary vaccination series.

Main Results:

• Both the two-dose and three-dose regimens achieved high seroconversion rates (93.1% and 94.6%, respectively).
• No significant differences were observed between the groups in the proportion of infants with high anti-hepatitis B surface antigen (anti-HBs) titers.
• Anti-HBs geometric mean titers were comparable between the two groups (82 mIU/ml vs. 92 mIU/ml).

Conclusions:

• A two-dose regimen of 5 micrograms of hepatitis B vaccine is sufficient to induce a high immunogenic effect in infants.
• This simplified schedule offers a viable alternative for infant hepatitis B vaccination, potentially improving compliance and reducing healthcare burden.
• The findings support the efficacy of a reduced dosing schedule for hepatitis B vaccination in pediatric populations.