Bird Flu Is Spreading in Alarming New Ways

H5N1 has infected cattle across the US and jumped from a mammal to a human for the first time. Experts fear it may someday evolve to spread among humans.

Bird Flu Is Spreading in Alarming New Ways
H5N1 has infected cattle across the US and jumped from a mammal to a human for the first time. Experts fear it may someday evolve to spread among humans.
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