Posted by: Sandy Steinman | November 15, 2025

Bay Area county sees more than 351K birds killed by bird flu

SF Gate reported

Bird flu cases are on the rise in Sonoma County after three farms tested positive for the deadly virus beginning in late October, according to recent data from the U.S. Agriculture Department.

Highly pathogenic avian influenza, or HPAI, a deadly strain of bird flu, was detected by the USDA in three Sonoma County poultry farms on Oct. 27, Oct. 28 and Nov. 5. The unnamed farms had a collective 351,700 birds killed, according to data gathered by the agency.


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