Madison, WI (AP) -  Wisconsin records its first outbreak of dangerous bird flu strain.

A dangerous bird-flu strain that has hit numerous turkey farms in the Midwest has been identified in a Wisconsin chicken flock.

The U.S. Department of Agriculture said Monday that the case marks the first case of the highly pathogenic H5N2 strain in a U.S. commercial chicken farm and the disease's first appearance in Wisconsin.

Authorities stressed there's no risk to public health or the food supply.

The disease made its first appearance in the region in Minnesota last month, and scientists suspect it's being spread by migratory waterfowl.

The USDA says tests confirmed that a flock of about 200,000 chickens in Jefferson County, in southeastern Wisconsin, has been infected. State agriculture officials say all will be killed to prevent the spread of the disease.