Cytomegalovirus is commonly present in the environment throughout the world, and most people are exposed to the virus early in life. When they are infected, they experience a cold or flu-like syndrome, and then recover. This virus does not leave the body with recovery, however. Instead, it remains in a dormant state as long as the immune system remains competent. If the immune system becomes impaired, then the virus can reactivate and begin multiplying again. This document will discuss symptoms, treatment, and overall outlook for this condition.