The United States is experiencing a resurgence in measles cases in 2026, with federal health data revealing that infections are increasing in certain areas of the country.

Centers for Disease Control and Prevention (CDC) officials released new data showing that there have been 4,588 confirmed measles cases in 2026 nationwide as of Oct. 22, 2026, which is more than double the total number of cases in 2025.

By the numbers: In 2026, there have been 43 new outbreaks and 96% of confirmed cases are "outbreak-associated" (3,020 from outbreaks starting in 2026 and 1,384 from outbreaks that started in 2025).