Revision History

An adult in Douglas County, Colorado died of hantavirus pulmonary syndrome in May 2026, marking the state's first such death since 2024. Colorado ranks second nationally in total hantavirus cases since 1993, yet more than three decades after the virus was identified, there remains no approved vaccine or antiviral treatment, and the case fatality rate holds near 36% — a figure that prevention campaigns and medical advances have barely moved.