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An infected passenger with a rare breakthrough infection may have exposed others during the trip last week between New York City and Washington, DC, health officials say.
The vaccinated person from Minnesota became infected while traveling abroad after returning to the US, boarded the train from NYC before becoming sick several days after arriving in DC.
DC Health said the person visited multiple locations in DC while contagious.
Amtrak is contacting passengers who may have been exposed.
Measles is a highly contagious illness that can spread easily through the air when an infected person breathes, coughs, or sneezes.
People with measles are contagious from four days before the rash appears several days after the rash appears.
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