Abstract
Introduction: To evaluate the long-term immunity and immunologic memory provided by universal hepatitis B vaccination program at birth, and to evaluate the booster effects of different dosages of hepatitis B vaccine on children, who lost protective antibody titers to hepatitis B surface antigen (HBs – Ag), this study was conducted. Methods: community-based sero-epidemiologic study was done on 453 healthy 10.5 years old Iranian children, one decade after implementation of a mass hepatitis B vaccination program. A booster vaccination with different dosages was given for children who did not have protective level of anti-hepatitis B surface antigen antibody (anti-HBs). Quantitative serologic responses to different dosages of vaccine were compared using X2 statistical test. Results: A total of 42% children (191 of 453) children had low concentration (
Keywords
Hepatitis B vaccine, Booster dose vaccination, Immunologic memory, Long-term immunity. هپاتیت B، واکسن هپاتیت B، خاطره ایمنی، واکسن یادآور.
Copyright
© 2004, Author(s). This open-access article is available under the Creative Commons Attribution 4.0 (CC BY 4.0) International License (https://creativecommons.org/licenses/by/4.0/), which allows for unrestricted use, distribution, and reproduction in any medium, provided that the original work is properly cited.