The presence of highly pathogenic avian influenza (HPAI) has been confirmed in a second commercial turkey flock in Stanislaus County, California.

The new case was announced by the United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS). According to APHIS, the case was confirmed on October 13, and there were 54,900 birds in that flock.

This marks the second HPAI case in Stanislaus County in 2022. The first case was confirmed 10 days earlier, with 51,000 turkeys affected.

With the latest case, the number of birds affected by HPAI in 2022 in California is approaching 700,000. Other California counties to have commercial flocks affected by the virus include Tuolumne, Fresno and Monterey.

Another Utah case reported

APHIS also reported that another case of HPAI was confirmed in Sanpete County, Utah, on October 13. APHIS identified the affected flock as a commercial turkey flock, but it has not yet disclosed how many turkeys were involved in this case.

Sanpete County has now had 15 cases of HPAI in 2022. According to APHIS, those first 14 cases involved a total of 481,900 turkeys.


To learn more about HPAI cases in commercial poultry flocks in the United States and Canada, see an interactive map on 

Read our ongoing coverage of the global avian influenza outbreak.

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