A herpesvirus infection caused by Cytomegalovirus. Healthy individuals generally do not produce symptoms. However, the infection may be life-threatening in affected immunocompromised patients. The virus may cause retinitis, esophagitis, gastritis, and colitis. Morphologically, it is characterized by the presence of intranuclear inclusion bodies. The disease is Monarch Disease Ontology entry MONDO_0005132 (cytomegalovirus infection). Also known as: CMV infection, Cytomegaloviral infection, HCMV infection.