Ongoing measles transmission across multiple states continues to drive case accumulation toward the end of May, with the CDC reporting 1,842 confirmed cases through May 7, 2026—up from 1,792 as of April 23. Most cases remain outbreak-associated and concentrated among unvaccinated individuals or those with unknown status, consistent with patterns seen in 2025 when totals reached 2,288. Weekly CDC surveillance updates and state health department notifications provide the primary near-term data releases that could shift market-implied odds, as new laboratory-confirmed reports are reconciled. International travel and domestic events during the spring season sustain importation risks, while vaccination coverage gaps in affected communities support continued spread.