F2 and hepatitis A virus infection: Lab-examination showed: white blood cell = 15.7 × 109/L, neutrophil (NE)% = 77.8%, hemoglobin = 122 g/L, platelet = 207 × 106/L; albumin = 27.4 g/L, alanine aminotransferase = 112 U/L, aspartate aminotransferase = 80 U/L, total bilirubin 30.3 μmol/L, direct bilirubin = 10.2 μmol/L; blood ammonia = 106 μmol/L; prothrombin time = 17.4 seconds, prothrombin time activity = 76.2%, international normalized ratio = 1.16, activated partial thromboplastin time = 30.0 seconds; carbohydrate antigen 19-9 150.20 U/L, carbohydrate antigen 12-5 174.50 U/L, hepatitis related tests are negative.