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flag CDC reports first severe U.S. bird flu case; rare mutations in virus strain raise concerns.

flag The CDC has reported the first severe case of bird flu in the U.S., involving a Louisiana resident over 65. flag The patient's strain, D1.1 genotype, shows rare mutations not seen in infected backyard birds, potentially allowing the virus to bind better to human cells. flag The risk to the public remains low, and no transmission to others has been detected.

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