The primary driver behind the 97.5% market-implied probability of no hantavirus pandemic in 2026 is the successful containment of the limited Andes virus cluster on the MV Hondius cruise ship earlier this year. Official CDC and WHO monitoring of hundreds of contacts across multiple countries ended in June and July with no sustained human-to-human transmission or new cases reported in the United States or elsewhere. Most hantaviruses remain strictly rodent-borne, transmitted via urine, feces, or saliva rather than efficient respiratory spread, and even the Andes strain requires prolonged close contact for limited person-to-person transmission. While the 23% case fatality rate and 4–42 day incubation period prompted swift quarantines, expert consensus from surveillance data highlights the low pandemic potential absent major evolutionary changes. A realistic scenario that could alter the outcome would involve undetected rodent reservoir expansion combined with a mutation enabling sustained airborne transmission in dense populations before containment measures activate.