Dozens of people are fighting a rare illness in Illinois.  Several hospitals have recently reported clusters of a severe respiratory illness, especially children.  The CDC has identified the illness as a rare form of Entovirus.  It's transmitted through close contact with an infected person and by touching objects after an infected person has touched them.  State officials say they're keeping a close watch on the situation.  They say people can keep the virus at bay by washing their hands with warm, soapy water, avoiding shaking hands with people who are sick, and cleaning frequently touched surfaces.  People who are having a hard time breathing should see a doctor immediately and, they should stay home from work or school until they feel better.