GPT and hepatitis A virus infection: On a course of HAAA, hepatitis can be detected on some of the following parameters: subsequent increase in serum Alanine Trasnaminase (ALT), Aspartate Transaminase (AST), by at least three times above the normal values which are 6 to 41U/l, 9-34U/l, 5-58U/L for ALT and AST respectively [12, 18, 30, 35, 36, 43, 52, 53], increase in serum Alkaline phosphatase (ALP), gamma glutaryl transferase (GGT) and billirubin (39-117U/l, 5-58 U/l, and 2-7 micromol/L, respectively).