(Wilton, CA) — Bird flu has been detected at a poultry farm in Northern California. Officials are looking into an outbreak at Nilsen Farms, in the small town of Wilton in Sacramento County, which supplies turkeys to Foster Farms.

KCRA 3 reports that the California Department of Food and Agriculture has euthanized the infected birds. This is the fourth time bird flu has been reported in Sacramento County this year.

On Wednesday, the department reported the virus in was also found in three poultry flocks located in Kern County, Stanislaus County, and Tulare County