A second type of bird flu has been found in U.S. dairy cows for the first time, the U.S. Department of Agriculture announced.

While the risk to humans of exposure from cows or milk remains low, this new flu spillover from birds into cows raises the need for continued surveillance.

The variant of bird flu that killed a Louisiana resident has now been found in dairy cows. Until now, the human cases of bird flu traced to cattle have been mild, mostly eye infections.

The finding indicates that the virus, known as H5N1, has spilled from birds into cows at least twice — leading to these two ...

On January 31, 2025, the U.S. Department of Agriculture announced that dairy cows in Nevada have been infected with a new ...