Measles cases in U.S. in 2026?

Above 4000 is priced on both venues: 74¢ on Polymarket and 90¢ on Kalshi, 16 points apart. Across the 60 contracts Kanon currently matches on both venues the median difference is 3.0 points. The two are matched outcome by outcome. These are mid prices rather than the price either book would actually fill at, and a difference is only a difference if both venues settle the question the same way. Polymarket prices 11 outcomes on this event. least 500 is the shortest at 100¢, 0 points clear of least 1000.

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