
A new H5N1 bird flu mutation has appeared in a cluster of infected dairy cows.
It's a genetic change that scientists say could not only make the virus more lethal, but increase its spread between mammals and possibly humans.
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A new H5N1 bird flu mutation has appeared in a cluster of infected dairy cows.
It's a genetic change that scientists say could not only make the virus more lethal, but increase its spread between mammals and possibly humans.