U.S. Measles Cases in 2026 Surpass Total for All of 2025, Marking Worst Year Since 1991

The United States has recorded 2,318 measles cases as of Thursday, July 24, 2026, according to an update from the U.S. Centers for Disease Control and Prevention (CDC) on Friday. This figure exceeds the 2,289 cases reported in all of 2025, making 2026 the worst year for measles in the U.S. since 1991. Major outbreaks in South Carolina, Utah, and Arizona have contributed to hundreds of illnesses, with smaller clusters emerging in other states. International health officials are set to meet in November to assess whether the U.S. and Mexico have lost their measles-free status.