The market's overwhelming 98.9% probability for "No" on a hantavirus outbreak by June 30 reflects the contained nature of the sole recent cluster—an Andes virus event on the MV Hondius cruise ship in April–May 2026 that produced roughly 13 confirmed or probable cases and three deaths, all among passengers or crew. Contact tracing across dozens of countries, including 42-day monitoring of U.S. repatriated individuals that concluded June 6 with zero secondary infections, has shown no sustained person-to-person transmission beyond the ship. Endemic North American hantaviruses cause only sporadic, rodent-linked cases rather than rapid outbreaks, and official surveillance through mid-June reports no new clusters meeting typical public-health thresholds. While an undetected imported case or novel rodent exposure could theoretically emerge in the remaining days, the short window, completed monitoring, and low baseline incidence make such developments improbable.