Therefore, we next compared the amino acid sequences of HA and NA in available H5N8 viruses from domestic poultry and wild birds in the public database Influenza Research Database (https://www.fludb.org/brc/home.spg?decorator=influenza) and Global Initiative on Sharing All Influenza Data (http://platform.gisaid.org/epi3/frontend; Fig. 3). Here, XK is linked to influenza.