This screening usually includes the history and tests for Cytomegalovirus (CMV) Epstein-Barr virus Hepatitis B virus Hepatitis C viruses Herpes simplex virus (HSV) HIV Mycobacterium tuberculosis Varicella-zoster virus West Nile virus, if exposure is suspected Positive findings may require pre - or posttransplantation antiviral treatment (eg, for CMV infection or hepatitis B or hepatitis C) or anti-tuberculosis treatment or, in the case of active infection, contraindicate transplantation until the infection is controlled (eg, if HIV with AIDS is detected).