ViroPharma Initiates Clinical Program with Maribavir for Prevention of Cytomegalovirus (CMV) Infection in Transplant Patients EXTON, Pa., Feb. 5, 2004 (PRIMEZONE) -- ViroPharma Incorporated (Nasdaq:VPHM) today announced the initiation of a clinical program to develop maribavir, an oral antiviral drug that inhibits...