Chicago O’Hare Issues Health Alert After Possible Measles Exposure in Terminal 1

Public health officials have issued a precautionary warning after a traveler who later tested positive for measles spent extended time inside Chicago O’Hare International Airport. Because measles spreads extremely easily through the air, authorities say the incident could have put other passengers and airport workers at risk.

Where and When the Exposure May Have Happened

According to officials, the infected adult was primarily in Terminal 1 at O’Hare—one of the busiest transportation hubs in the United States. The potential exposure window includes:

• April 22 between 10:00 a.m. and 8:00 p.m.
• April 23 between 10:00 a.m. and 8:00 p.m.

With thousands of travelers moving through the terminal each hour, even a single case can trigger a large-scale response, especially in high-traffic areas like security lines, boarding gates, restrooms, and food courts.

Why Measles Is Treated as a Serious Airport Health Risk

Measles is widely considered one of the most contagious viral illnesses. It can spread through coughs and sneezes, and the virus may remain in the air for a period of time after an infected person leaves an area. That’s why airports—where people from many regions mix indoors—are especially sensitive locations for possible exposure events.