div class=trans-pagebuttonPage 1button div class=trans-image a href=https:reader040fdocumentsusreader040viewer20220205225750680d1a28ab0f07ae5e9ahtml5page1jpg target=_blank amp-img class=trans-thumb alt=Page 1: A Two-stage Transfer of Pathogenicity between the MEL and NWS Strains of Influenza A Virus src=https:reader040fdocumentsusreader040viewer20220205225750680d1a28ab0f07ae5e9ahtml5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divp© Nature Publishing Group1958pdivdiv class=trans-pagebuttonPage 2button div class=trans-image a href=https:reader040fdocumentsusreader040viewer20220205225750680d1a28ab0f07ae5e9ahtml5page2jpg target=_blank amp-img class=trans-thumb alt=Page 2: A Two-stage Transfer of Pathogenicity between the MEL and NWS Strains of Influenza A Virus src=https:reader040fdocumentsusreader040viewer20220205225750680d1a28ab0f07ae5e9ahtml5thumbnails2jpg width=142 height=106 layout=responsive amp-imga divp© Nature Publishing Group1958pdiv