The Chicago Department of Public Health issued a public health alert on September 24, 2026, warning that a potential measles exposure may have occurred at Union Station in downtown Chicago. The notice advises anyone who was present at the transportation hub during the relevant time frame to be aware of the risk and to watch for signs of infection.
The department, which tracks communicable diseases throughout the city, said the alert was triggered after a case of measles was identified that could be linked to the busy terminal. While the exact number of individuals potentially exposed has not been disclosed, officials emphasized that measles remains highly contagious and can spread quickly in crowded settings.
People who think they may have been at Union Station during the period in question are urged to monitor themselves for typical measles symptoms, which include fever, cough, runny nose, red eyes, and a distinctive rash that often begins on the face and spreads downward. The health agency recommends that anyone who develops these signs seek medical evaluation promptly, especially if they have not been vaccinated against measles or are unsure of their immunization status.
The Chicago Department of Public Health routinely issues alerts when it identifies possible exposure events, aiming to inform the public and reduce further transmission. This latest warning reflects the agency’s ongoing surveillance efforts and its commitment to rapid communication in response to emerging health threats. Residents are reminded that vaccination remains the most effective protection against measles and that maintaining up‑to‑date immunizations is a key component of community health safety.
Officials have not indicated any immediate closures or service disruptions at Union Station as a result of the alert. The department will continue to monitor the situation and provide updates should additional information become available.