The United States recorded 2,260 confirmed measles cases as of July 16, 2026, surpassing last year's full-year total in half the time and putting the country on pace for its worst measles season since 1991. The Centers for Disease Control and Prevention, which released the updated count as part of its national measles tracker, also confirmed 34 separate outbreaks in 2026 and warned public health departments that summer travel is now one of the primary mechanisms driving new exposure events.
The last time measles cases were this high in a single year was more than three decades ago, when the U.S. recorded 9,643 cases. That year, a sustained campaign of catch-up vaccination eventually brought the crisis under control. The current situation is different in a critical way: vaccination rates have been declining in recent years, and the communities most at risk are concentrated in identifiable geographic clusters with persistently low MMR coverage.
