Cytomegalovirus (CMV) is a common virus that can infect almost anyone. In fact, the majority of adults are chronically (permanently) infected with it. Usually the virus is "silent" (does not cause any symptoms) and is not detected in the blood when checked. In transplant patients, however, it can be cause for great concern, as the viral infection can become active, causing different types of issues.
While there may be several antiviral medications available to prevent or treat CMV, there could be situations in which these treatments cannot be used or do not give the desired response.