St. Croix Cluckers Confirm Bird Flu News | October 18, 2022 | 0 | by Morgan McCarthy A flock of backyard chickens in St. Croix County is Wisconsin’s latest bird flu case. The state’s Department of Agriculture confirmed an outbreak last week. Wisconsin saw nearly three million-birds put down after a bird flu outbreak in the spring. The case in St. Croix County is the third in the past two months. The other two were at commercial bird operations in Dunn and Racine counties.