The Cook County cases follow the first case of measles this year in Illinois in an unvaccinated adult in Marion, reported last week.

So far this year, the CDC has confirmed nearly 900 measles cases in the country. As the infection continues spreading from state to state, it’s starting to get closer to Central Illinois. Public health officials say there were two measles cases confirmed in the Chicago area — one at O’Hare International Airport

The Chicago Department of Public Health is focusing increasing education about vaccines for children in pre-K settings.