US measles cases are up in 2024. What's driving the increase?

In this March 27, 2019, file photo, a woman receives a measles, mumps and rubella vaccine at the Rockland County Health Department in Pomona, N.Y. (AP Photo/Seth Wenig, File)

Measles outbreaks in the U.S. and abroad are raising health experts’ concern about the preventable, once-common childhood virus.

One of the world’s most contagious diseases, measles can lead to potentially serious complications. The best defense, according to experts? Get vaccinated.

Here’s what to know about the year — so far — in measles.How many measles cases has the U.S. seen this year?