Current CDC Travel Health Notices remain at Level 2 for polio circulation across 32 countries and Level 1 for dengue in 16 others, with no Level 4 advisories active as of mid-May 2026. The recent hantavirus outbreak linked to a cruise ship prompted only a low-level CDC emergency activation and targeted clinician alerts, without evidence of sustained U.S. transmission or extreme risk thresholds. Historical patterns show Level 4 notices require novel pathogens or uncontrolled epidemics exceeding current surveillance data, and no such escalation appears imminent before year-end. Traders assign roughly 77.5 percent probability to no issuance, reflecting stable epidemiological indicators and the absence of model forecasts projecting rapid deterioration.