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A second version of bird flu is infecting cows. What does that mean?

Signs of the virus showed up in tested milk from dairy cattle in Nevada

Seven cows in a dairy barn facing the camera head on.

A second form of H5N1 bird flu was detected in dairy cattle. The finding comes amidst a yearlong outbreak in the animals that has yet to be contained.

Michael M. Santiago/Getty Images

By McKenzie Prillaman

The same version of the bird flu that has caused the most serious human illnesses in North America has now turned up in dairy cows.