Wisconsin Confirms H5N1 Avian Flu in Jefferson County

By Blake Jackson

The Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP) has confirmed a case of highly pathogenic avian influenza (HPAI) in a commercial poultry flock in Jefferson County. State officials are coordinating with the U.S. Department of Agriculture (USDA) on a joint response to contain the virus and prevent further spread.

The affected farm has been placed under quarantine, restricting the movement of poultry and related products. As part of standard disease control procedures, the flock will be humanely depopulated. None of the birds from this operation will enter the food supply.

The H5N1 strain of HPAI has been circulating in wild and domestic birds across North America since late 2021. This strain is highly contagious and frequently deadly to domestic poultry.

Avian influenza is caused by influenza type A viruses, and the severity of illness depends on the strain involved and the species infected. The virus can spread through direct contact with infected birds, exposure to wild birds or their droppings, and contaminated equipment or clothing worn by caretakers.

DATCP is urging poultry and livestock owners statewide to strengthen biosecurity practices. Recommended measures include frequent handwashing, disinfecting equipment, limiting visitor access, and isolating new animals for at least 30 days before introducing them to an existing flock or herd. Poultry owners are also encouraged, when feasible, to house birds indoors to reduce exposure to wild birds.

When HPAI is detected in Wisconsin, officials establish a 10-kilometer control area around the infected site to regulate animal movement. Poultry producers can use DATCP’s online mapping tool to determine whether their farms fall within an active control or surveillance zone.

The Wisconsin Department of Health Services and Jefferson County Public Health are monitoring farmworkers who may have been exposed. At this time, the risk to the general public remains low. Livestock owners are reminded to register their premises to ensure timely communication during disease events.

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