| − | maribavir (mar-I-buh-veer) is a substance that blocks the ability of viruses to make new viruses and infect cells. It is being studied in the prevention of cytomegalovirus infection in cancer patients who have had a donor stem cell transplant. It is a type of antiviral agent. | + | maribavir (mar-I-buh-veer) is a substance that blocks the ability of viruses to make new viruses and infect cells. It is being studied in the prevention of cytomegalovirus infection in cancer patients who have had a donor stem cell transplant. It is a type of [[antiviral]] agent. |