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 urges all travelers to be fully vaccinated against measles amid rising cases in the US, some linked with international travel.

As summer approaches, U.S. health officials have issued a critical update for those planning to travel internationally. The Centers for Disease Control and Prevention (CDC) now advises all American travelers to receive a measles vaccination prior to leaving the country.