Washington State Reports First Human Death Linked to Rare H5N5 Bird Flu Strain
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A resident of Washington state has died after contracting a rare strain of bird flu, identified as H5N5, prompting examination by state and federal health officials. While this marks a possibly first-of-its-kind human fatality linked to this specific strain, authorities emphasize that the risk to the general population remains low.
According to a statement released by the Washington State Department of Health, the individual was an older adult with pre-existing health conditions. The person, who resided in Grays Harbor County – approximately 80 miles southwest of Seattle – had been exposed to domestic poultry that had come into contact with wild birds.
initial Findings and Public Health Response
Health officials are actively monitoring individuals who had close contact with the deceased, but so far, “no other person involved has given positive for bird flu,” a senior official stated. This suggests, at this stage, no evidence of human-to-human transmission. The US Centers for Disease Control and Prevention (CDC) issued a statement in early November affirming that this single case does not indicate an increased risk to public health.
Why did this happen? the death occurred in an older adult with underlying health conditions who had exposure to domestic poultry that interacted with wild birds. This suggests the virus jumped from wild birds to poultry, then to the individual. Who was affected? A resident of Grays Harbor County, Washington, was the single confirmed human fatality. What strain caused the death? The rare H5N5 strain of avian influenza was identified as the cause. How did it end? The individual succumbed to the illness, and health officials are monitoring contacts for any signs of infection, but currently, there is no evidence of human-to-human transmission.
H5N5 Compared to H5N1
The emergence of H5N5 has naturally drawn comparisons to the more widely known H5N1 virus. In 2024 and 2025, H5N1 was responsible for approximately 70 infections in people across the United States, primarily mild cases observed among workers in dairy and poultry farming.
Though, there are key distinctions between the two strains. The critical difference lies in a protein that regulates the virus’s release from infected cells, influencing its ability to spread.One analyst noted that this difference could potentially effect the transmissibility of H5N5, though further research is needed to fully understand its implications.
Health authorities are continuing to investigate the circumstances surrounding this case and are committed to ongoing surveillance. They emphasize the importance of vigilance, particularly for individuals working with poultry. While the current assessment indicates a low risk to the public, the situation remains fluid and will be closely monitored.
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The CDC continues to provide guidance on preventing avian flu infections,including avoiding contact with sick or dead birds and practicing good hygiene. This case serves as a stark reminder of the ever-present threat of zoonotic diseases and the importance of proactive public health measures.
