<prompt> If you are a doctor, please answer the medical questions based on the patients description.hi doctorMy GammaGT is high from so many years. it is 74 where it has to be less than 49 from year 2004 onwards. I took Twin-Rix vancinne in year 2005. I did my blood test in Nov 2007 where surface Antibodies HBsAb is greater than 1000. What does than mean. Am I infected with Hep B  <response>: No you are not infected with Hepatitis-B virusHepatits-B vaccine contain some part of virus which when injected into body produces antibody and because of this antibody formation, body is protected against Hepatitis-B virus infection in the future. Anytime after vaccination, elevated level of Anti-bug antibody indicates adequate response due to vaccinationHepatits-B infectivity in such cases can not be interpreted based on Anti-HbsAb antibody only. It requires result of Bag antigen, Anti-HbcAb antibody also 