The United States has officially confirmed its first-ever case of the rare H5N5 avian influenza strain, diagnosed in a resident of Washington State. The case marks the first human infection with H5N5 in the country since February, as reported by the Washington State Department of Health (DOH). The affected individual, described as an older adult with underlying health conditions, was hospitalized after exhibiting influenza-like symptoms in early November.
According to the DOH, the patient had a mixed backyard flock of domestic poultry at home that was exposed to wild birds. The virus, identified as H5N5, is an avian influenza virus previously reported in animals but never before in humans. Public health officials emphasize that transmission from birds to humans is extremely rare, and as of now, there is no increased risk to the public. The Centers for Disease Control and Prevention (CDC) and DOH currently consider the risk of avian influenza to be low.
The case also highlights a broader trend of rising bird flu cases across the country, with recent infections confirmed in Georgia. Health experts stress the importance of caution for poultry owners, wildlife handlers, and others who have contact with animals. Measures include avoiding contact with sick or dead birds, using protective equipment, and reporting sightings of sick wildlife or domestic animals to the Washington State Department of Agriculture (WSDA).
While the seasonal flu vaccine does not prevent bird flu infections, it remains important because co-infection with both viruses could potentially lead to the emergence of a more transmissible avian influenza strain. The CDC had previously declared the bird flu emergency over in July, citing a decline in animal infections and a lack of human cases since February. However, the emergence of H5N5 in a human case raises concerns about the evolving nature of the virus and its potential future impact.