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  • Rights: Public domain - U.S. Government Published 9 November 2008 Size: 9.5 MB Referencing Hub media

    A colourised electron transmission micrograph of avian influenza A H5N1 virus, commonly known as ‘bird flu’. Avian influenza A viruses do not usually infect humans; however, several instances of human infections and outbreaks have been reported since 1997.

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