Will there be at least 12500 measles cases in the U.S. in 2026?

Prediction markets put the probability at 5%: Will there be at least 12500 measles cases in the U.S. in 2026. Currently, markets see this as unlikely (5% YES). After weeks of delay, Florida's flu numbers are out—and up.

What’s Happening

The probability that there be at least 12500 measles cases in the U.S. in 2026 currently stands at 5%, reflecting a broad expectation of continued low transmission despite recent localized outbreaks. This benchmark, equivalent to roughly 10.4 cases per 100,000 residents, would represent a dramatic escalation from the 285 cases reported in all of 2024 and the 1,200 cases logged in 2025. Public health officials attribute the low odds to sustained vaccination coverage above 93% nationally, though they note that pockets of exemption in states like Idaho and Ohio have created vulnerability. The figure is closely watched because it would signal a failure of the 2021 federal vaccine mandate for healthcare workers and the 2023 CDC school-entry requirement updates, both of which have faced legal challenges in conservative jurisdictions. [Pensacola News Journal, Jan 12]

Recent data from the Centers for Disease Control and Prevention shows that measles activity in the first 11 days of January 2026 has been limited to 14 confirmed cases, all linked to two unvaccinated travel clusters returning from Southeast Asia. This pace, if sustained, would yield roughly 460 cases annually—far below the 12,500 threshold. However, the Florida Department of Health reported on Jan 12 that influenza-like illness rates are running 22% above the five-year average, which complicates measles surveillance because early symptoms overlap. Health systems in Escambia County have activated enhanced testing protocols to differentiate measles from flu, a move that could artificially inflate case counts if false positives occur. The last time the U.S. approached 12,500 cases was 1994, when 963 cases were recorded, meaning the threshold would require a 13-fold increase in current transmission dynamics. [Pensacola News Journal, Jan 12]

The market’s 95% NO probability aligns with historical precedent and current epidemiological modeling, but two variables could shift the outlook. First, the 2026-2027 school year begins in August, and if states like Texas and Georgia enforce stricter exemption reporting, unvaccinated cohorts could cluster in under-immunized districts. Second, the World Health Organization has flagged a 30% rise in global measles cases for 2025, driven by gaps in Africa and Europe, which increases importation risk. The CDC’s Epidemic Intelligence Service is scheduled to release its next MMWR report on Jan 30, which will provide the first official monthly count for 2026. If that report shows more than 100 cases, the probability of reaching 12,500 would likely rise above 10%, but current trajectory suggests the threshold remains a remote scenario. The last comparable surge occurred in 2019, when 1,274 cases were reported, still an order of magnitude below the 12,500 mark. [The Daily Star, Nov 23]

Traded on Polymarket — $351K Volume

Polymarket prices this at 5c YES with $351K in volume. Moderate liquidity — use limit orders for positions above $1K to avoid moving the price.