The number of measles cases associated with an outbreak in western Texas has grown to 400 cases amid reports of some children taking unhealthy amounts of vitamin A.

Washington, D.C. officials warned that a person with a confirmed cases of measles may have exposed others at the city’s Union Station and an urgent care.

A measles outbreak that started in Texas has already spread to two other states and experts worry this number could grow.

The first confirmed case of measles this cold and flu season has been confirmed in Washington, D.C. per a press release shared on Tuesday.

The latest data from the Centers for Disease Control and Prevention show 378 people in 18 states have been diagnosed with measles. Outbreaks have occurred primarily in the South Plains and Panhandle regions of Texas and neighboring Lea County, New Mexico, according to the CDC.

DC Health confirmed a case of measles on Tuesday morning and said the person diagnosed visited several places while contagious, including Amtrak.

As a measles outbreak spreads across the United States, doctors are now seeing a new and unexpected danger: children getting sick from taking too much vitamin A.

The U.S. has seen an uptick in measles cases this year, but what about in Washington? According to the Centers for Disease Control and Prevention, 378 cases of the disease have been confirmed so far in 2025 in 18 states, including two cases in Washington.