The Chelan-Douglas Health District (CDHD) confirmed a case of Sin Nombre virus (SNV) Hantavirus in a Chelan County resident on February 2026.
CDHD Public Health Officer Dr. James Wallace stated that Hantavirus infections are rare but severe, with one to five cases typically reported annually in Washington residents. The case is unrelated to recent Andes virus cases linked to a cruise ship. Health officials warn that exposure most likely occurred near the resident's home where mice were encountered, emphasizing that Hantavirus spreads through contact with rodent droppings, urine, or saliva, not person-to-person.
CDHD recommends airing out enclosed spaces for 30 minutes before cleaning, wearing protective gear including N-95 respirators, and avoiding stirring up dust in rodent-infested areas. Symptoms of Hantavirus Pulmonary Syndrome include fever, muscle aches, and shortness of breath, with about one-third of cases proving fatal.