Carle Hospital is limiting who can visit its younger patients.
Officials say with so many germs going around, they're taking every precaution they can.
The limit is five adults per patient under 18, and the only children allowed are siblings of the patients.
The hospital is worried about a type of respiratory virus called Enterovirus D68.
Officials say there has not been a confirmed case in the area yet, but doctors suspect it is going around.