Maryland warns of possible measles exposure at Hyattsville business center

Anyone who was inside the New Hampshire Business Center in Hyattsville on April 24 may have been exposed to measles, after Maryland health officials said a Washington, D.C. resident visited the site while infectious. The exposure window ran from noon to 6:30 p.m. at 6495 New Hampshire Ave., putting a Prince George’s County business address at the center of a fast-moving regional alert.

Maryland Department of Health said measles can remain in the air for up to two hours after an infected person leaves, which is why even brief overlap at the building could matter. People who were there during the exposure period should watch for symptoms for 21 days after exposure, which for April 24 means through May 15.

Health officials urged anyone who develops symptoms to stay home and call a health care provider before going to a waiting room or emergency department. Typical measles symptoms include fever, cough, runny nose, red eyes and a rash, and people who are not fully vaccinated or otherwise immune face the greatest risk.

The department also said people who are unsure about their vaccination status should check records with a provider or through MyIR, Maryland’s immunization record system. Two doses of measles-containing vaccine, or being born before 1957, generally means a person is protected.

The Hyattsville notice came as part of a broader regional run of measles alerts tied to the same Washington, D.C. case. Local notices in D.C., Maryland and Virginia also pointed to exposures at Dulles International Airport and on multiple Metro bus and rail trips between April 23 and April 27, raising concern that a single case could touch commuters, travelers and office workers across the Washington area.

Maryland health officials said there was no known connection between the Hyattsville exposure and previous Maryland measles cases reported in 2026. The state had already confirmed its first measles case of the year on April 19, then announced two more cases on April 24 involving Baltimore metro area residents who had recently traveled to an area with active measles transmission.

State data had shown Maryland with three travel-related cases in 2025 and no new cases in 2026 before the April cluster. The Centers for Disease Control and Prevention has said the U.S. was already dealing with 24 measles outbreaks in 2026, with 93% of confirmed cases linked to outbreaks, a sign that a warning in Hyattsville can quickly become part of a much wider public-health problem.