First Human Death Linked to Rare H5N5 bird Flu strain in Washington State
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The risk to the general public remains low following the first confirmed human death attributed to a rare strain of avian influenza, H5N5, in Washington state. Health officials announced Friday that the individual, an older adult with pre-existing health conditions, contracted the virus after potential exposure through a backyard poultry flock.
A statement released by the Washington State department of health detailed the case, noting the patient had been hospitalized as early November exhibiting symptoms including a high fever, confusion, adn respiratory distress. The individual resided in Grays Harbor County, approximately 78 miles southwest of Seattle, and maintained a small flock of domestic poultry that had come into contact with wild birds.
Public Health Response and Risk Assessment
Despite this tragic outcome,authorities are emphasizing that the current risk to the public is minimal.”The risk to the public remains low,” a state health official stated. Extensive contact tracing is underway, with health officials monitoring individuals who had close contact with the deceased. Crucially, “there is no evidence of transmission of this virus between people” at this time.
The Centers for disease Control and Prevention (CDC) previously issued a statement earlier this month, affirming that the case did not indicate an increased risk to public health. this assessment is particularly relevant given the ongoing spread of another avian influenza strain, H5N1.
H5N5 vs. H5N1: Understanding the Differences
While the H5N5 case marks a concerning first, experts believe it dose not pose a greater threat to human health than the more prevalent H5N1 virus. A wave of approximately 70 reported human infections with H5N1 have been documented in the US during 2024 and 2025, with the majority of cases resulting in mild illness among workers in dairy and poultry farming environments.
The key distinction between H5N5 and H5N1 lies in a specific protein responsible for viral release and spread. This difference impacts how effectively the virus can infect and propagate within host cells.
The situation remains fluid, and health officials will continue to monitor for any signs of wider transmission or changes in the virus’s behavior.
Expanded News Report:
What Happened? A Washington state resident, an older adult with underlying health conditions, died after contracting the H5N5 strain of avian influenza. The individual, from Grays Harbor County, was hospitalized in early November with symptoms of high fever, confusion, and respiratory distress. Exposure is believed to have occurred through contact with a backyard poultry flock that interacted with wild birds.
Who Was Affected? The primary individual affected was the deceased resident of Grays Harbor County. Health officials are also monitoring individuals who had close contact with the patient as part of contact tracing efforts. workers in poultry and dairy farming environments are also at increased risk of exposure to the related H5N1 strain.
why is this Significant? This marks the first confirmed human death linked to the H5N5 strain globally. While the public health risk remains low, it highlights the potential for avian influenza viruses to cross the species barrier and infect humans. The case is prompting increased surveillance and monitoring by health authorities.
How Did it End? The individual tragically succumbed to the illness despite hospitalization. Health officials emphasize there is currently no evidence of human-to-human transmission. The CDC and
