13. Known history of HIV infection or active hepatitis B (chronic or acute) or hepatitis C infection. But: a. Patients positive for hepatitis C virus (HCV) antibody are eligible only if polymerase chain reaction (PCR) is negative for HCV RNA. b. Patients with past or resolved hepatitis B infection (defined as having a negative hepatitis B surface antigen [HBsAg] test and a positive anti-HBc [antibody to hepatitis B core antigen] antibody test) are eligible, but should sample for HBV DNA and referral to virologist to monitor for HBV reactivation