H5N1 avian influenza, often called bird flu, was first identified in the United States in 2014. Since then, the virus has moved beyond wild birds, spreading into farm animals and eventually infecting people. More than 70 human cases have been reported in the U.S. since 2022, including two deaths. Because the virus is still circulating widely among animals, scientists warn that it has ongoing chances to adapt in ways that could allow it to spread…
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