Ongoing measles transmission across multiple U.S. states continues to drive confirmed case counts higher in 2026, with the Centers for Disease Control and Prevention reporting 1,842 cases as of May 7, including 25 new outbreaks and 93 percent linked to sustained chains of spread. Low vaccination coverage in affected communities, combined with travel-related importations, has sustained activity primarily among unvaccinated or unknown-status individuals. The largest prior outbreak in South Carolina has concluded, yet clusters along the Utah-Arizona border and in other jurisdictions persist. Weekly CDC surveillance updates through summer, when increased domestic and international travel may accelerate introductions, represent key data releases that could shift totals before year-end resolution criteria are assessed.