What worries scientists about bird flu's spread among cattle

Here's what worries scientists about bird flu's spread among cattle Avian influenza is still spreading among dairy cattle. Scientists are paying close attention to how the virus is changing and what that means for its pandemic potential. NPR

The unlikely spread among cattle and one dairy worker has scientists looking through the data to better understand this spillover. They say the risk to humans hinges on whether the virus can evolve in key ways to better infect mammals.

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