A Double Blind Randomised, Comparative Study of the Immunogenicity and Reactogenicity of Three Different Lots of GlaxoSmithKline Biologicals' Combined Hepatitis A - Hepatitis B Vaccine When Administered in Healthy Adults

The aim of this study is to evaluate the long-term persistence of hepatitis A and B antibodies at Years 11, 12, 13, 14 and 15 after subjects received their first dose of a 3 dose primary vaccination schedule of combined hepatitis A/hepatitis B vaccine. The Protocol Posting has been updated in order to comply with the FDA Amendment Act, Sep 2007. This protocol posting deals with objectives & outcome measures of the extension phase at Year 11-15.