The U.S. Centers for Disease Control and Prevention is advising those planning to travel internationally to make sure they’re vaccinated against measles. The warning, issued last week, says cases of the highly contagious disease are on the rise around the world.

The CDC is urging vaccination before international travel due to the increased risk of a measles exposure. Learn how to protect yourself, including whether you might need a vaccine booster.

Measles cases are on the rise in many countries around the world, prompting the U.S. Centers for Disease Control and Prevention to update its travel warning.