Serological and biochemical tests performed in May 2013 showed that patient 2 was anti-HBc positive, HBsAg and anti-HBs negative (serological evidence of past hepatitis B infection), alanine aminotransferase (ALT) of 64 IU/L and aspartate aminotransferase (AST) of 59 IU/L. The gene discussed is GPT; the disease is hepatitis B virus infection.