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2003 FEB 12 - (NewsRx.com & NewsRx.net) -- Researchers in Taiwan have investigated the long-term effects of hepatitis B vaccine and booster shots among adolescents.
"The long-term immunogenicity of universal hepatitis B virus (HBV) vaccine is seldom studied in large-scale prospective community-based populations, especially in adolescents. This study enrolled 1200 children aged 7 years with complete HBV immunization in infancy and determined HBV surface antigen (HBsAg), its antibody (anti-HBs), and HBV core antibody (anti-HBc) annually until the children were aged 14 years. Eleven children had new HBV infections with anti-HBc positivity as the only marker," researchers in Taiwan reported.
"None became positive for HBsAg or had detectable HBV DNA by polymerase chain reaction. The percentage of protective anti-HBs in 951 children without booster vaccination gradually decreased from 71.1% at age 7 years to 37.4% at age 12 years. Only 1 of the 200 children in the booster group and 2 of the 258 children in the nonbooster group developed new anti-HBc positivity," ...
Source: HighBeam Research, Taiwan study looks at long-term effects of hepatitis B vaccine.