(NewsNation) — Health officials in the U.S. are telling all travelers that regardless of where you’re flying to, it’s important to make sure you’re vaccinated against measles.

The Centers for Disease Control and Prevention updated its guidance last week. The health agency previously advised travelers of the importance of vaccination for travelers going to countries that have had an outbreak of the disease.

FDA Commissioner Dr. Marty Makary told NewsNation that measles has a mortality rate of about one in 1,000 people, and usually found in people with co-morbid conditions. But he added that vaccination is effective, and that those who’ve had the disease before needn’t worry.

“It’s basically natural immunity once you’ve recovered from measles,” Makary said.

The travel notice advises two vaccination doses for all Americans ages 1 and older. An early dose is advised for traveling infants ages 6 months to 11 months. The U.S. has seen more than 1,000 measles cases so far this year.