Worldwide, there were an estimated 10.3 million cases of measles in 2023, a 20% increase from 2022, according to new estimates from the World Health Organization (WHO) and the U.S. Centers for Disease Control and Prevention (CDC). Inadequate immunization coverage globally is driving the surge in cases.

Measles is preventable with two doses of measles vaccine; yet more than 22 million children missed their first dose of measles vaccine in 2023. Globally, an estimated 83% of children received their first dose of measles vaccine last year, while only 74% received the recommended second dose.