Bird flu cases are becoming more of a concern nationwide, and just two weeks ago, one human case was confirmed in Barron County. Experts are saying the spread of the virus stems from handling specific farm animals,

H5N1 outbreaks have led to the losses of commercial flocks in Barron, Trempealeau, Washburn and other Wisconsin counties.

The farm worker, who has a "presumptive positive" test for "highly pathogenic" bird flu, was exposed to an infected commercial flock of poultry, officials said.