Ongoing measles transmission driven by multiple active outbreaks continues to shape trader sentiment on cumulative U.S. case counts through May 31. As of May 14, the CDC has confirmed 1,893 cases in 2026 across 40 jurisdictions, with 93 percent outbreak-associated and 92 percent occurring in unvaccinated or unknown-status individuals; the largest ongoing cluster in Utah now exceeds 663 total cases. These figures reflect sustained person-to-person spread in under-immunized communities, consistent with historical patterns where low MMR vaccination coverage enables rapid amplification following imported index cases. Weekly CDC surveillance updates, expected later this week and again before month-end, will provide the final official tallies used for market resolution, with any additional travel-related imports or localized clusters potentially accelerating the count in the remaining two weeks.