WASHINGTON, United States (AFP) — A resident of Washington state has died after contracting a rare strain of bird flu previously reported in animals, state health officials said — the second human fatality linked to the virus in the US this year.

The patient was only identified as “an older adult with underlying health conditions” and had been hospitalized since early this month, the Washington state department of health said Friday.

Tests conducted by the University of Washington confirmed the patient was suffering from H5N5 avian influenza, the department said in a statement, calling it "the first recorded infection with this variant in a person globally."

The result was confirmed by the US Centers for Disease Control and Prevention.

“The risk to the public remains low. No other people involved have tested positive for avian influenza,” it said. “There is no evidence of transmission of this virus between people.”

The patient has “a backyard flock of mixed domestic birds,” and officials believe this was the source of exposure.