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Global concern about the potential for pandemic avian influenza is rooted in the pathogenicity of avian influenza virus strains in humans and the lack of immunity to these highly mutable viruses in the general population. Avian influenza A (H5N1) re-emerged in 2003 with greater virulence and a wider host range than that seen following its 1997 debut. Although transmission of avian influenza A (H5N1) from animals to humans remains inefficient at this time, mutation o… More >>
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