New avian influenza case confirmed in Wisconsin

HPAI Confirmed in Marquette County Poultry Flock

MADISON, Wis. — The following is an update on Highly Pathogenic Avian Influenza (HPAI) caused by the influenza virus H5N1. On December 4, HPAI H5N1 was confirmed in a backyard poultry flock in Marquette County. Access the press release. Find information on biosecurity to protect your farm from infectious diseases. There have been no detections of HPAI H5N1 in Wisconsin cattle. DATCP and the Wisconsin Department of Health Services (DHS) continue …

New avian influenza case confirmed in Wisconsin

Map: USDA map of commercial flocks affected with H5N1 avian influenza as of 12/9/2025 A new case of highly pathogenic avian influenza has been confirmed in Wisconsin.  Department of Agriculture, Trade, and Consumer Protection officials say the new case affected 38 birds in a backyard flock in Marquette County.  It’s the first new case in […] The post New avian influenza case confirmed in Wisconsin appeared first on Brownfield Ag News.