Levels of anti-hepatitis B surface antibody (anti-HBs) after booster vaccination for young adults.

<p>Each data point represents one student aged 17–23 years, born after the adoption of universal neonatal immunization for hepatitis B. All these 69 students were negative for HBsAg and anti-HBs before booster vaccination. Anti-HBs levels were determined one month after the first dose and 2–4 months after the third dose of booster vaccination with 20 mcg of ENERGIX-B (GlaxoSmithKline Biologicals, Belgium).</p