Emma Worden-Sapper

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Bird flu is transmitted mainly by wild birds, like these snow geese in Ruthsberg, Md., in January 2023. Photo by JIM WATSON/AFP via Getty Images

As bird flu continues to spread in the US and worldwide, what’s the risk that it could start a human pandemic? 4 questions answered

Sara Sawyer, University of Colorado Boulder; Emma Worden-Sapper, University of Colorado Boulder, and Sharon Wu, University of Colorado Boulder

Avian influenza viruses have evolved to infect birds, but the current H5N1 outbreak is also infecting a wide range of mammals. This suggests that it could mutate into forms that threaten humans.

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