Yikes! Wash your hands.

(CNN) — A respiratory virus is sending hundreds of children to hospitals in Missouri and possibly throughout the Midwest, officials say.

The virus causes symptoms like a cold, except worse, and is prompting up to 30 children a day to seek care at one Kansas City hospital, where about 15% of the youngsters were placed in intensive care, officials said.

In a sign of a possible regional outbreak, Colorado, Illinois and Ohio are reporting cases with symptoms similar to the same virus and are awaiting testing results, according to officials and CNN affiliates in those states.