Now that bird flu is spreading among cows, scientists worry where H5N1 will jump next
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![Just days after early reports of sick cows at several U.S. farms, H5N1 bird flu has been identified in at least a dozen herds across six states. Scientists are on high alert. But many say what worries them more is whether this virus will jump to more livestock — and pigs, in particular. A meadow with cows taken from the air with a drone.](https://i.cbc.ca/1.7162648.1712173425!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_620/herd-of-cows.jpg)
Bird flu outbreaks among U.S. cattle are a new twist in a growing global crisis. And it could be a harbinger of more species-jumps to come, including the rising possibility of H5N1 appearing in livestock like pigs — which scientists warn could help this virus better adapt to humans, too.