Polio is one of many viruses belonging to the "enterovirus" family.
The viral infection sending hundreds of Midwestern kids to the hospital is EV-68, a rather nasty strain of enterovirus.
This strain of enterovirus seems unusually provocative in irritating lower airways, thereby causing airway narrowing.
enterovirus en·ter·o·vi·rus (ěn'tə-rō-vī'rəs)
A virus of the genus Enterovirus. Also called enteric virus.
A genus of picornaviruses, including polioviruses, coxsackieviruses, and echoviruses, that infect the gastrointestinal tract and often spread to other areas of the body, especially the nervous system.