Measles cases in U.S. in 2026?

Resolution Criteria

This market will resolve to "Yes" if there have been the specified amount or more confirmed cases of Measles (Rubeola) in humans in the territory of the United States of America in 2026 according to the CDC case counter between January 1, 2026, 12:00 AM ET and December 31, 2026, 11:59 PM ET. Otherwise, this market will resolve to "No". The resolution source for this market will be the CDC Measles (Rubeola) counter (see: https://www.cdc.gov/measles/data-research/index.html) at the resolution time. If the counter becomes unavailable, another credible source will be used. Note: Only cases reported by the CDC Measles (Rubeola) counter will qualify, regardless of reports from U.S. State agencies or other sources.

Prediction markets on 2026 U.S. measles cases show volume heavily concentrated on the lower thresholds, with the 2,000-case and 3,000-case markers the heaviest-backed outcomes to resolve 'Yes'. Higher thresholds of 5,000, 7,500, 10,000, and 12,500 cases are far less supported. Each outcome resolves according to the CDC's official Measles (Rubeola) case counter by 31 December 2026.

Market structure

The market spans nine outcome thresholds ranging from 2,000 to 12,500 confirmed measles cases in the United States during calendar year 2026. Volume is heavily concentrated at the lower end, thinning markedly above 5,000 cases. Resolution requires the CDC's Measles (Rubeola) counter to register the specified number of confirmed cases between 1 January and 31 December 2026. If the CDC counter becomes unavailable, an alternative credible source will be used. State-level reporting alone does not qualify.

Background

The United States experienced its largest measles outbreak in decades in 2025, centred on communities in Texas and New Mexico with lower vaccination rates, surpassing 1,000 confirmed cases — a threshold not reached since measles was declared eliminated domestically in 2000. The resurgence has been linked to declining MMR vaccination uptake in certain communities, including some with religious or philosophical exemptions to school immunisation requirements. The CDC tracks confirmed Rubeola cases nationally, aggregating state-level reports into a single counter. The 2025 outbreak reignited public health debate about vaccination policy, school entry requirements, and the role of federal health agencies in outbreak response at a time of significant organisational change within those agencies.

Key factors

Several structural factors will determine how 2026 case counts develop. First, the trajectory of existing outbreak clusters — particularly whether transmission chains established in Texas, New Mexico, and other affected states are interrupted through targeted vaccination campaigns or continue to spread into new communities. Second, overall MMR vaccination coverage: any further decline in two-dose coverage among school-age children directly widens the susceptible population. Third, importation risk — measles remains endemic in many countries, and international travel creates ongoing exposure pathways, particularly to under-vaccinated communities. Fourth, public health infrastructure and response capacity, including the speed of outbreak detection and contact tracing, will influence containment. Fifth, policy changes affecting school vaccination exemptions at the state level could alter herd immunity thresholds. Finally, the availability and continuity of CDC surveillance and reporting functions will affect what is officially counted, given the resolution criteria's strict reliance on the CDC counter.

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