Hepatitis B viral infection (HBV) DNA genome containing cyclic viridae Hpadna family is created. HBsAg hepatitis B surface glycoprotein is. The surface antigens, the index of a (amino acids 147-124) in the humoral immune response is an important goal. Measuring antibodies against the antigens used as an indicator of immunity. Remove viruses from a biological point classically by the appearance of antibodies (anti-HBs) against the Australian antigen (HBs Ag) in serologic profile is determined. People who are chronic carriers of the virus antigen in serum virus for years, but they do not appear HBs antibodies. Antibody due to previous encounter with infection, improve or Ayjadaymny vaccination against hepatitis B is through. In those who have been infected with hepatitis B Anti-HBs is usually "At the end of the window (Window Period) and the subsequent erasure of HBs Ag in the blood serum and the title appears to remain high for years. Non-Anti- HBs after the window period confirms that it chronically infected person has almost "occurs in 5% of patients.