GPT and hepatitis A virus infection: He was found to have developed HBV reactivation (HBV DNA 8.53 × 105 IU/ml with HBsAg seroconversion and severe hepatitis with a significant elevation of serum ALT level of 592.1 U/L (ULN 40 U/L) and TB level of 35.4 umol/L (ULN 21 umol/L).