What does cytomegalovirus mean?
Cytomegalovirus, often abbreviated CMV, is a common virus belonging to the herpesvirus family. Its name reflects a hallmark seen under the microscope: infected cells become conspicuously enlarged ('mega' meaning large). Most infections produce no symptoms or only mild flu-like illness, which is precisely what makes the virus notable — it spreads silently through saliva, urine, blood, and other bodily fluids, then remains dormant in the body for life, like all herpesviruses. It becomes medically serious in two groups: babies infected before birth, where congenital CMV is a leading cause of hearing loss and developmental problems, and people with weakened immune systems, such as transplant recipients, in whom the virus can reactivate and damage the eyes, lungs, or digestive tract. Because of this, cytomegalovirus features prominently in obstetrics, transplant medicine, virology research, and public health guidance.
nounA herpesvirus of the genus Cytomegalovirus that infects humans and other animals, typically causing mild or asymptomatic illness but capable of causing serious disease in newborns and immunocompromised people.
- The virus itself: a beta-herpesvirus (human herpesvirus 5) that establishes lifelong latent infection.
- By extension, any disease caused by this virus, as in 'cytomegalovirus retinitis' or 'congenital cytomegalovirus'.
- The taxonomic genus name Cytomegalovirus within the family Herpesviridae.
"Pregnant women are routinely advised about precautions against cytomegalovirus, the most common infection passed from mother to unborn child."
"Newborn screening programs now test for congenital cytomegalovirus, the leading infectious cause of childhood hearing loss."
"After his kidney transplant, he was placed on prophylaxis against cytomegalovirus reactivation."
Rarely used, since the word normally refers to one specific viral species; biologists would more often discuss related viruses individually rather than as a plural group.
"Both cytomegaloviruses isolated from the patient showed the same drug-resistance mutation."
Most people who carry cytomegalovirus have never heard its name — yet it infects roughly half of adults worldwide and hides quietly for life.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cytomegalovirus
The word was formed in the twentieth century from Greek roots combined with the Latin-derived term 'virus': 'cyto-' comes from the Greek 'kytos' (hollow vessel), the standard prefix denoting cells, while '-megalo-' derives from the Greek 'megas' (large). The name was chosen because cells infected by the virus visibly swell. It belongs to a broad family of scientific compounds built on these same classical roots, alongside terms such as cytology and megaphone.
How cytomegalovirus is actually used
Strictly a technical medical term used in clinical, scientific, and public-health contexts rather than everyday conversation. In medicine it is often abbreviated as CMV. The plural is rarely needed since the word usually denotes a single viral species.
Easily confused with cytomegalovirus
'Cytomegalic' is an adjective describing the enlarged cells characteristic of infection, whereas 'cytomegalovirus' is the virus itself.
Mononucleosis is a clinical syndrome that cytomegalovirus can cause, but it is more classically associated with Epstein–Barr virus.