The updated guidance advises that all Americans 1 year and older should have two doses of the MMR vaccine and infants 6 to 11 months old should receive one early dose before travel. More than 1,000 measles cases have been reported in the United States so far this year, CDC data show.

The CDC recently issued a travel warning for Americans as measles cases continue to rise around the world. Measles is a highly contagious respiratory illness that spreads to others through coughing and sneezing.

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.