The person had received one dose of the MMR vaccine, which gives partial protection, but later developed symptoms including a rash. Testing confirmed measles, and the individual is now isolating at home while health officials work to trace contacts.
The concern grew even more after a second measles case was reported in the same Illinois county soon afterward. Officials have not yet confirmed whether the two cases are connected, but the timing has made the investigation more urgent.
Health experts say vaccination is still the best protection, with two MMR doses being highly effective. Anyone who was in Terminal 1 during the exposure window should watch for symptoms like fever, cough, red eyes, runny nose, and rash, and should contact a healthcare provider before going in person if symptoms appear.
