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Comparison of HA1 amino acid substitutions between 2012 and 2016 isolates of Western Australian swine influenza H3N2 (a) and H1N2 (b) viruses and antigenically cross-reactive influenza A virus antigens. Known HA1 antigenic sites are boxed in gray and numbered according to the H3 (47) and H1 (32) numbering systems. Dots denote positions with amino acid residues identical to those of sw/Western Australia/2577766G/2012(H3N2) and sw/Western Australia/2577896X/2012(H1N2).
