**Ongoing measles transmission across 47 U.S. jurisdictions, fueled by sustained outbreaks and vaccination gaps, continues to drive weekly case increases as the September 30 cutoff approaches.** As of September 24, 2026, the CDC reports 3,659 confirmed 2026 cases—already far exceeding the 2,289 full-year total for 2025—with 95% unvaccinated or of unknown status and 9% hospitalized. Pennsylvania leads with over 800 cases amid multiple active outbreaks (40 reported nationally), while recent weeks have added 171–188 cases. CDC data reflect confirmed reports through Thursday updates; the next weekly release and state surveillance reports will provide the final counts for market resolution, with transmission patterns showing little immediate slowdown in the final days of the month.