According to the state health department website cases are up by 186 percent. The infection, also called Pertussis, can be dangerous for adults and young kids.School districts are on the lookout because cases have already been reported in Sioux Falls and Harrisburg in the last two weeks.

In Illinois, 1,058 cases have been reported so far this year, compared to just 199 at this time last year. Dr. David Nguyen, an infectious diseases specialist at Rush University System for Health, says whooping cough can be dangerous with infants.