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. 2004;2(11):909–914. doi: 10.1038/nrmicro1027

Figure 2. Comparison of the haemagglutinin 1 (HA1) domain from the 1918, 1957 and 1968 pandemic viruses and various other avian strains with their avian consensus sequence.

Figure 2

The data show that the HA of the 1918 pandemic virus differs from the H1 avian consensus to a much greater extent than the 1957 human H2 and 1968 human H3 differ from their respective avian consensus sequences.