gin of all mammalian IAVs (not known for bat H17 and H18 viruses) including all human IAVs [123]. CoVs use their spike (S) glycoproteins in N- and/or C-terminal domains of the S1 subunit, S1-NTD and/or S1-CTD, respectively, as indicated in Table 2. Specially, CoVs in lineage A of the genus βCoV have additional spike glycoproteins, hemagglutinin-esterases (HEs), possibly acquired from influenza C virus (ICV) during mixed infection [124]. A CoV structure with S and HE spikes and positions of S1-NTD and S1-CTD on the S spike are shown in Figure 2. Bat CoVs