Beyond the Known: Human Life Lost to a Bird Flu Strain Never Before Seen

In the soft, gray dawn of a rural Washington morning, a somber story unfolded: a resident of Grays Harbor County has died after contracting a bird flu strain never before confirmed in a human. According to the Washington State Department of Health (DOH), the person was an older adult with underlying health issues and had been hospitalized in King County since early November.

Lab testing identified the virus as H5N5, a subtype of avian influenza that until now had been observed only in animals. The Centers for Disease Control and Prevention (CDC) confirmed the finding, marking what appears to be the first recorded human infection with H5N5 in the world.

Health officials have expressed condolences to the family, while also stressing that the risk to the general public remains low. No other person in close contact with the patient has tested positive, and there is currently no evidence of human-to-human transmission.

Investigators believe the likely source of infection was the patient’s backyard flock of mixed domestic birds, which had access to wild birds. Environmental sampling confirmed the presence of avian influenza virus in the bird-keeping area. The DOH is working with the Washington State Department of Agriculture and local health officials to further understand how the virus spread.

Avian influenza (type A) naturally circulates in wild aquatic birds. Though it sometimes infects other bird species and even mammals, human infections remain rare. The DOH is urging people who keep backyard poultry to be cautious: avoid contact with sick or dead birds, report any bird illnesses, and take preventive steps.

Officials also recommend that anyone exposed to domestic or wild birds get a seasonal flu vaccine. While the vaccine does not protect against bird flu, it reduces the risk of co-infection with a human flu strain — a scenario that could theoretically raise the risk of a more dangerous virus emerging.

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Sources Washington State Department of Health NBC Right Now KIRO 7 News ABC News CNN