WASHINGTON (7News) — The Maryland Department of Health (MDH) is warning the public of potential exposure after someone with a confirmed case of measles traveled through Washington, D.C., and Maryland while infectious in early January.

Health officials said the person traveled on multiple public transportation systems from Jan. 7 through Jan. 8, potentially exposing others to the highly contagious virus.

No exposures were identified inside Baltimore/Washington International Thurgood Marshall Airport (BWI), according to MDH.

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Locations and times of possible exposure

Anyone who was on the following conveyances during the listed times may have been exposed:

Jan. 7 (9 p.m. to 11:30 p.m.) – Amtrak Northeast Regional train from Philadelphia 30th Street Station to Washington, D.C., Union Station Jan. 7 (10:45 p.m. to Jan 8, 1:30 a.m.) – Amtrak BWI Shuttle to and from the BWI train station and lower-level airport drop-off points Jan 7 (11:00 p.m. to Jan. 8, 2 a.m.) – BWI Airport Parking Shuttle to and from long-term parking lots

Health officials said more exposures occurred in other states and will be addressed by those jurisdictions.

What to do if exposed to measles

Measles spreads easily through the air when an infected person breathes, coughs, or sneezes. Officials urge anyone who may have been exposed to:

Check vaccination status – People who received two doses of a measles-containing vaccine, or who were born before 1957, are typically considered protected. Call a healthcare provider or local health department if not fully vaccinated or immune. Look out for symptoms for 21 days after exposure. Symptoms in the early stages include fever over 101 degrees Fahrenheit, cough, runny nose, and red, watery eyes, followed days later by a rash that appears on the face and spreads. Health officials say people with measles are contagious from four days before the rash shows up to four days after it begins.

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Anyone with these symptoms should stay home and call a doctor before visiting a medical facility to stop further spread.

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According to MDH, measles cases are rare in Maryland, and reports showed there have been no confirmed cases so far in 2026, following three cases in 2025, one each in 2023 and 2024, and none from 2020 to 2022.