Sustained weekly incidence of roughly 170–190 new confirmed measles cases, driven by 40 active outbreaks across 47 jurisdictions, is the main factor shaping trader views on U.S. totals by October 31. CDC data through September 24 show 3,659 cases year-to-date—already exceeding prior elimination-era annual records—with 95% outbreak-linked and 95% occurring in unvaccinated or unknown-status individuals. Pennsylvania remains the largest cluster, while national trends reflect pockets of sub-95% MMR coverage that sustain transmission. Weekly CDC surveillance releases, updated model projections of outbreak trajectories, and any state-level vaccination campaigns or school mandates in the next five weeks represent the key near-term data points that could shift implied probabilities.
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