The contamination was found after a Washington County house cat died from consuming raw frozen pet food contaminated with H5N1, or bird flu.
H5N1 outbreaks have led to the losses of commercial flocks in Barron, Trempealeau, Washburn and other Wisconsin counties.
Northwest Naturals pet food tested positive for the bird flu and had a genetic match with a cat that died after consuming it.
An animal sanctuary in Shelton, Wash., is under quarantine after a bird flu outbreak killed 20 big cats at the facility over ...