Fatal hantavirus case confirmed in Douglas County adult

State and local health officials confirmed a fatal hantavirus case in a Douglas County adult, putting a rare but often deadly rodent-borne disease back in focus for homeowners and property managers across Castle Rock, Lone Tree, Castle Pines and Sedalia.

The Colorado Department of Public Health and Environment said it is working with the Douglas County Health Department on the investigation. County health officials say hantavirus is carried by rodents and can cause a potentially deadly respiratory illness, with deer mice the key animal reservoir tied to Colorado risk.

The timing matters. Douglas County Health Department says hantavirus often shows up in spring, when people begin cleaning garages, sheds, crawl spaces and other dusty storage areas where rodent urine, droppings or nesting material may have collected through winter. That makes the danger less about one isolated illness and more about common household chores that can stir contaminated dust into the air.

Health officials say people usually get infected by breathing dust contaminated with rodent urine, droppings or saliva. The county advises residents to avoid contact with rodents and droppings, seal entry points around homes and outbuildings, wear gloves when cleaning contaminated areas, use disinfectant or a bleach solution, and avoid sweeping or vacuuming dry droppings. Those precautions are especially important in enclosed spaces such as attached garages, unfinished basements, barns and storage sheds.

Colorado has tracked hantavirus since 1993, and the Centers for Disease Control and Prevention says U.S. surveillance began the same year after the Four Corners outbreak. Hantavirus disease is nationally notifiable, and CDC says 890 laboratory-confirmed cases had been reported in the United States through the end of 2023. One Colorado advisory has said more than one-third of Colorado hantavirus patients have died since tracking began, underscoring how serious the illness can be even though it remains rare.

The county’s public warning also helps separate the local case from the other hantavirus story drawing attention this month. CDC says the cruise-ship outbreak involves Andes virus, and no Andes-virus cases have been confirmed in the United States from that incident. Douglas County officials say the public risk in the county remains extremely low, but the fatal case is a sharp reminder that rodent cleanup should be handled carefully before anyone opens up spaces that sat untouched all winter.