Overview
- Philadelphia health officials identified potential exposures on Jan. 7 at Philadelphia International Airport’s Terminal A East (7:50–11 p.m.) and 30th Street Station (8:15–11:25 p.m.), with the traveler continuing on a southbound Northeast Regional train.
- Maryland health officials listed possible exposures on the Amtrak Northeast Regional from Philadelphia to Washington on Jan. 7 (9–11:30 p.m.) and on BWI-area shuttles late Jan. 7 into early Jan. 8, noting no exposures inside BWI terminals.
- Health departments advise people who were present during the listed times to confirm MMR vaccination or other immunity, monitor for symptoms for 21 days, and call ahead before seeking medical care.
- Measles spreads through the air and can linger in enclosed spaces for up to two hours, with symptoms typically beginning 7–14 days after exposure and a period of contagiousness that spans before and after rash onset.
- Georgia confirmed its first measles case of 2026 in an infant infected during international travel in the Coastal Health District, with contact tracing underway, as the U.S. recorded at least 2,144 cases in 2025, mostly among the unvaccinated.