First-ever human case of rare bird flu strain confirmed in western US

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The Washington State Department of Health (DOH) has confirmed that a resident of Grays Harbor County is the first person in the U.S.known to be infected with theH5N5 strain of avian influenza.

The case also marks the country’s first human bird flu diagnosis since February.

The patient, described by officials as “an older adult with underlying health conditions,” remains hospitalized after showing influenza-like symptoms in early November.

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The DOH stated that the individual “had a mixed backyard flock of domestic poultry at home that had exposure to wild birds.

“Additional testing shows the virus to be H5N5, anavian influenza virusthat has previously been reported in animals but never before in humans.”

A caged hen feeds at an egg farm in San Diego County in this picture taken July 29, 2008.

The H5N5 virus is a close cousin of H5N1 — both are types of bird flu — but they’re not the same, experts say.(Reuters/Mike Blake)

Domestic poultry and wild birds are considered the most likely sources of thevirus exposure, though the health investigation is ongoing.

Public health experts have not found any increased risk to the public to date, according to the press release.

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“Transmission of avian influenza between humans is extremely rare and has never been documented in the United States,” the report states.

Older man in hospital bed, only hand is shown

The patient, who is only described as an “older adult,” remains hospitalized as of the latest report.(iStock)

The Centers for Disease Control and Prevention and DOH “currently consider the risk to the public from avian influenza to be low.”

domestic animalsto the Washington State Department of Agriculture (WSDA).

Person getting a flu shot closeup of needle

“Infection with both [regular flu and bird flu] could result in the emergence of an avian influenza virus that is more easily transmitted from person to person.”(iStock)

The release also emphasizes that although theseasonal flu vaccinedoes not prevent bird flu infections, it is important because “infection with both viruses could result in the emergence of an avian influenza virus that is more easily transmitted from person to person.”

bird flu emergency officially over.

The agency’s emergency response to H5N1 bird flu, which was activated in 2024, was “deactivated” July 2, the agency told Reuters, citing declining animal infections and an absence of human cases since February.

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The H5N5 virus is a close cousin of H5N1.While both virusescome from birdsand share part of their genetic code, H5N5 has a different “end piece” of its structure that changes how it behaves, experts say.

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While H5N1 has caused human illness — and even deaths — for years, H5N5 has mostly been limited to birds until now, per health officials.

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