Measles cases in the U.S. hit a near 30-year high with 1,168 cases across 33 states in 2025.

Measles cases in the U.S. have quadrupled since 2023, with 1,168 confirmed cases across 33 states, nearing a 30-year high. Most affected individuals are unvaccinated, and childhood vaccination rates have dropped in nearly 80% of U.S. counties since the pandemic. Domestic and international travel contribute to the disease's spread. Three deaths have been reported in the 2025 outbreak, and if the outbreak persists until January 2026, the U.S. could lose its measles-eliminated status.