Health officials have issued a warning about possible measles exposure at Chicago’s O’Hare International Airport. The alert has raised concerns due to the highly contagious nature of the disease. According to authorities, an infected individual spent several hours in Terminal 1 on April 22 and 23 between 10 a.m. and 8 p.m., meaning hundreds of travelers may have been exposed. The patient had received one dose of the MMR vaccine, which provides some but not full protection, and developed a rash on April 25.

Testing later confirmed the case as measles. The individual is now isolating at home while officials trace contacts. Just days later, a second measles infection was reported in the same Illinois county, adding urgency to the investigation. Measles spreads through coughing and sneezing and can linger in the air for up to two hours. Even brief contact in enclosed spaces like airports can lead to transmission.

Doctors emphasize that vaccination remains the best protection. Two doses of the MMR vaccine are about 97 percent effective at preventing measles. Those unsure of their vaccination status are urged to check records and, if necessary, get vaccinated. Measles is considered one of the world’s most infectious diseases, and airports like O’Hare are high-risk zones because of the constant flow of domestic and international travelers.

Health officials are asking anyone who was in Terminal 1 during the exposure period to watch for symptoms such as fever, cough, runny nose, red eyes, and rash. Anyone who develops signs should contact a healthcare provider immediately before visiting a clinic to avoid further spread. Early detection and isolation are critical to preventing a larger outbreak. Stay informed, stay vaccinated, and stay safe.