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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 Wednesday.

The U.S. Department of Agriculture said Wednesday that six dairy herds in Nevada have tested positive for a strain of bird flu associated with a man's death in January.

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.

A branch of the H5N1 bird flu family tree that hadn't previously been seen in cattle has now been detected in dairy cows.

Until last week, all bird flu in dairy herds had been identified as the B3.13 variant, which was believed to have come from ...