Here’s how to tell if you need another measles shot as cases rise across the U.S.

(Credit: Jan Sonnenmair/Getty Images)

• Thinking of getting a measles booster shot? Whether you need one depends on when you initially received doses as a child and your environment.

After being nearly eradicated in the U.S., measles is on the rise. There have been 321 reported cases so far this year, with 279 contained to Texas.