Measles cases have reached a 35-year high

Measles cases in the U.S. have surpassed 2025 levels to reach a 35-year high, with 2,318 confirmed cases as of July 23, 2026, primarily affecting unvaccinated individuals under 20. Cases are concentrated in 44 states and D.C., with the highest numbers in South Carolina, Utah, Texas, Virginia, and Pennsylvania, driven by vaccination rates below the 95% threshold needed to prevent outbreaks.