BALTIMORE, Md. — The Maryland Department of Health and Prince George’s County health officials confirmed two measles cases in Prince George’s County residents on March 20, 2025. The individuals, who traveled internationally together, are not connected to a prior Howard County case or outbreaks in New Mexico, Texas, and Oklahoma. Health officials are working to identify potential exposures, including notifying passengers on specific flights.
The cases prompted warnings for several locations where exposure may have occurred:
- Washington Dulles International Airport: Concourse A, transportation to the International Arrivals Building, and baggage claim, March 5, 8:00 a.m. to 12:30 p.m.
- Kaiser Permanente Largo Medical Center, 1221 Mercantile Ln, Upper Marlboro: March 5, 7:30 p.m. to March 6, 4:30 a.m.; March 13, 4:15 a.m. to 10:00 a.m.; March 15, 7:45 a.m. to 3:15 p.m.; March 17, 2:30 p.m. to 7:00 p.m.
- Ronald Reagan Washington National Airport: Terminal Shuttle Bus, March 14, 12:00 p.m. to 2:30 p.m.
- Washington Metro Area Transit: Yellow Line from Reagan National Airport to L’Enfant Plaza, transferring to Silver Line toward Downtown Largo, March 14, 12:15 p.m. to 3:15 p.m.
- Passport Toyota, 5001 Auth Way, Suitland: March 17, 10:00 a.m. to 1:30 p.m.
Unvaccinated or non-immune individuals at these locations during the listed times should monitor for symptoms—fever over 101°F, runny nose, cough, red, watery eyes—for 21 days post-exposure. A rash may appear one to four days later, starting on the face and spreading. Symptoms can emerge 7 to 21 days after exposure, with contagiousness lasting from four days before to four days after the rash begins.
Those developing symptoms should avoid public spaces and contact a healthcare provider, calling ahead to prevent spread. Exposures on March 15 or 17 may qualify non-immune individuals for post-exposure treatment; contact a provider or Prince George’s County Health Department at 301-583-3750 (business hours) or 240-508-5774 (after hours).
Immunity is assumed for those with two measles vaccine doses, prior confirmed infection, lab-confirmed immunity, or birth before 1957. The CDC recommends full vaccination before international travel, typically at 12 months, though infants as young as six months can be vaccinated for travel.
Maryland reports sporadic measles, with one case earlier in 2025, one in 2024, one in 2023, and none from 2020-2022. Virginia and D.C. residents can call 804-363-2704 (VDH) or 844-493-2652 (DC Health) for exposure concerns.
