GPT and hepatitis A virus infection: Liver enzymes, including alanine aminotransferase (ALT), aspartate aminotransferases (AST), and glutamyl transpeptidase (GGT), fluctuated more than the normal range after admission, while the patient exhibited normal liver function four years (October 2015) and one year (July 2018) before admission (Figure 1A), indicating that his hepatitis was derived from HEV infection.