The Los Angeles County Department of Public Health issued a warning on Saturday that passengers who were at Union Station during a four‑hour period on September 12 and 13 may have been exposed to measles. The alert follows confirmation that an individual with the contagious disease was present in the terminal during that time frame.
Health officials said the exposure window lasted approximately four hours over the weekend, encompassing both the afternoon of September 12 and the morning of September 13. The department has not released the identity of the infected passenger, but emphasized that measles can spread rapidly in crowded settings such as transit hubs.
Measles is a viral illness known for its high transmissibility, with one infected person capable of transmitting the virus to many others in close proximity. Symptoms typically include fever, cough, runny nose, red eyes and a distinctive rash that appears several days after infection. Because the disease can be serious, especially for unvaccinated individuals, the county is urging anyone who was at Union Station during the specified window to monitor for signs of illness.
The public‑health advisory advises travelers who develop fever, rash, or other related symptoms to seek medical evaluation promptly. Those who are unsure of their vaccination status are encouraged to contact their healthcare provider to discuss receiving the measles vaccine, which can provide protection if administered within a recommended time after exposure.
County officials are working with Union Station management to increase signage and distribute informational materials about the warning. They also plan to coordinate with local hospitals and clinics to ensure timely diagnosis and treatment for any potential cases.
Measles outbreaks have been rare in recent years, but the disease remains a concern in densely populated areas where people gather. The department’s alert underscores the importance of vaccination and rapid response to prevent further spread in public spaces.