Accelerated Schedule for Hepatitis B Immunization

Area of Science:

• Immunology
• Vaccinology
• Public Health

Background:

• Hepatitis B remains a significant public health concern, with many individuals lacking immunity.
• Rapid immunization is crucial for individuals at imminent risk of hepatitis B exposure.
• Current standard hepatitis B vaccine schedules require 2-6 months for full protection.

Purpose of the Study:

• To evaluate the immunogenicity and reactogenicity of a recombinant hepatitis B vaccine.
• To compare three different rapid vaccination schedules against a standard schedule.
• To determine the speed and durability of seroprotection induced by rapid schedules.

Main Methods:

• A randomized, multicenter study involving 524 healthy adults (18-59 years).
• Four vaccination schedules were compared: months 0, 1, 2 (Group A); weeks 0, 14, 28 (Group B); weeks 0, 7, 21 (Group C).
• Anti-HBs antibody levels were measured by radioimmunoassay, with seroprotection defined as >= 10 IU/L.

Main Results:

• Rapid schedules (Groups B and C) showed significantly higher seroprotection rates by day 28 compared to the standard schedule (Group A).
• Seroprotection rates exceeded 94% in all groups by months 7-8 and remained high (>95%) at 13 months.
• Local and general symptoms were transient and mild across all groups, with no significant differences.

Conclusions:

• Rapid administration of the recombinant hepatitis B vaccine at weeks 0, 7, 21 or 0, 14, 28, induces prompt and high seroprotection.
• The induced immunity is durable, persisting for at least 12 months post-vaccination.
• These rapid schedules offer a viable option for timely protection against hepatitis B.