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  1. In severe bird flu cases, the virus can mutate as it lingers ... - NBC News

  2. CDC Reports Potentially Troublesome Mutations in Bird Flu

  3. CDC Reports Potentially Troublesome Mutations in Bird Flu

  4. Bird flu mutations show potential for easier human spread ... - NBC News

  5. Bird flu virus isolated from hospitalized Canadian teen shows

  6. Genetic Sequences of Highly Pathogenic Avian Influenza A(H5N1) …

  7. Key warning signs about bird flu are all going in the wrong ... - NBC News

  8. Bird Flu Virus Mutation in First U.S. Severe Human Case May …

  9. First severe human case of bird flu in US: 'Concerning' mutation'

  10. CDC Issues Update on Bird Flu 'Mutations' in Humans

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