noun, plural ech·o·vi·rus·es.
- any of numerous retroviruses of the picornavirus group, some harmless and others associated with various human disorders, as aseptic meningitis.
- any of a group of viruses that can cause symptoms of mild meningitis, the common cold, or infections of the intestinal and respiratory tracts
also ECHO virus, 1955, acronym for enteric cytopathogenic human orphan; “orphan” because when discovered they were not known to cause any disease.
- Any of a number of retroviruses of the family Picornaviridae, inhabiting the gastrointestinal tract and associated with various diseases, such as viral meningitis, mild respiratory infections, and severe diarrhea in newborns.