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also ECHO virus, 1955, acronym for enteric cytopathogenic human orphan; "orphan" because when discovered they were not known to cause any disease.
echovirus ech·o·vi·rus (ěk'ō-vī'rəs) or ECHO virus (ěk'ō)
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.