A person with a confirmed measles case may have exposed Amtrak passengers on a recent train trip. An infected passenger with a rare breakthrough infection may have exposed others during the trip last week between New York City and Washington,

Washington, D.C. health officials are warning of a possible measles exposure on a recent Amtrak Northeast Regional train. DC Health said it was notified of a confirmed case of measles by a person who visited multiple locations in the capital city while contagious,