Health officials say a passenger arriving on an worldwide flight last Wednesday had a contagious case of measles.
The Chicago Tribune is reporting that the passenger was in both Terminal 1 and Terminal 5.
Health officials say the highest concern is for people who have not been vaccinated and were at the airport on January 10 during that window of time.
The Department of Health is warning other passengers that were in the airport between 6:30 a.m. - 1 p.m. on January 10, that they may have been exposed to measles.
For early detection, the Centers for Disease Control and Prevention suggests looking for Koplik spots.
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If you were in the airport, you may have been exposed to measles. If infected, symptoms could develop as late as January 23. If symptoms of measles develops, IDPH recommends people should call a health care provider before going to a medical office or emergency department.
Measles can also cause serious complications, such as pneumonia and swelling of the brain.
The person, who has not been identified, flew in from another country and landed, then boarded a second flight from Chicago to Little Rock, Arkansas. "We urge everyone to make sure they and their family members are up-to-date on measles/mumps/rubella (MMR) vaccine and all other age-appropriate immunizations".
Some symptoms of measles include rash, high fever, cough, runny nose, and red, watery eyes.
For more information about the disease, go to the Illinois Department of Health's website.