Washington Reports First Human Case of H5N5 Avian Influenza, Public Risk Remains Low
Grays Harbor County resident hospitalized; health officials say no evidence of human-to-human transmission
Washington state health officials have confirmed the first known human case of the H5N5 strain of avian influenza, marking the first documented instance of this specific virus infecting a person. Despite the rare detection, the Washington State Department of Health (DOH) and the Centers for Disease Control and Prevention (CDC) emphasize that the risk to the general public remains low.
The patient, an older adult with underlying health conditions, was hospitalized earlier this month with influenza-like symptoms. Health officials say the individual keeps a mixed backyard flock of poultry that had contact with wild birds — currently considered the most likely source of exposure. The investigation into the exact route of transmission is ongoing.
More than half of all human cases of avian influenza worldwide have involved people who were exposed to infected birds or animals. The DOH notes there is no evidence of human-to-human transmission in this case, and such transmission has never been documented in the United States. Out of caution, public health staff are monitoring anyone who may have had close contact with the patient.
What to Know About H5N5 and Avian Influenza
Avian influenza viruses occur naturally in wild aquatic birds and can spread to domestic poultry, where they may cause severe disease. On rare occasions, certain strains can infect people, typically after direct exposure to sick or dead birds. Reported human cases in the U.S. have ranged from mild to severe.
The risk generally rises during fall and winter due to migratory bird activity. Both backyard flocks and commercial poultry operations can be affected.
Who Is at Risk?
While the general public is considered low-risk, individuals who work with or are exposed to domestic or wild birds — including poultry owners, agricultural workers, and veterinarians — face a higher likelihood of contact with infected animals. Health officials recommend using personal protective equipment, such as gloves, masks, eye protection, and protective outerwear.
People with backyard flocks should avoid touching sick or dead birds and should report suspected avian influenza cases to the Washington State Department of Agriculture at 1-800-606-3056 or via the agency’s online reporting system. Wildlife sightings involving sick or dead birds should be reported to the Washington Department of Fish & Wildlife.
Officials also reinforce the importance of avoiding raw or unpasteurized dairy products and ensuring all meat and eggs are thoroughly cooked.
Seasonal Flu Vaccination Still Important
Although seasonal flu shots do not prevent avian influenza, they help reduce the chance of becoming infected with both human and avian flu strains at the same time — a rare but potentially concerning combination. The CDC recommends flu vaccination for everyone six months and older.
More information and updates are available through the Washington State Department of Health.
Cover image: stock photo, tawatchai07 on Freepik