Ongoing transmission across 47 U.S. jurisdictions, fueled by declining MMR vaccination coverage in multiple communities, drives elevated measles case counts through August 31. CDC data show 2,465 confirmed 2026 cases as of August 6, with 94% tied to 38 active or carryover outbreaks and 93% occurring among unvaccinated individuals. Measles’ high basic reproduction number sustains chains of infection once introduced, particularly in under-vaccinated clusters. Weekly CDC surveillance updates, typically released mid-week, provide the next authoritative tallies that could shift market-implied probabilities. Historical precedent indicates continued reporting from existing outbreaks is probable in the remaining three weeks, though exact increments depend on contact-tracing effectiveness and any localized public-health interventions.