Polymarket has introduced a prediction market speculating on the occurrence of hantavirus cases in the U.S. by May 15, 2026. The market currently estimates a 27% probability of a confirmed case, with trading volume reaching $139,700. The market will resolve as "Yes" if any laboratory-confirmed hantavirus infection is reported in the U.S. by the deadline, based on official sources like the CDC. Despite recent infections on the MV Hondius cruise ship, no confirmed cases have been reported in the U.S. this year.