Avian influenza is an acute infectious disease caused by influenza A virus,the recent emergence of highly pathogenic avian influenza A virus strains with subtype H5N1 pose a global threat to human health. Scientists first discovered that Avian Influenza subunit H5N1 could infect human in Hong Kong of China in 1997.After this,patients infected H5N1 were found in some Southeast Asia countries,and more and more countries or areas were involved including Vietnam,Poland and so on.WHO have already confirm...
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