 - Positive test results for chronic HBV infection defined as positive HBsAg serology: patients with occult or prior HBV infection defined as negative HBsAg and positive total HBcAb may be included if HBV DNA is undetectable, provided that they are willing to undergo monthly DNA testing. Patients who have protective titers of HBSAb after vaccination or prior but cured hepatitis B are eligible. 