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Table 3 Temporal distribution of the 33,018 HA sequences of IAVs in HA subtypes

From: Diversity and distribution of type A influenza viruses: an updated panorama analysis based on protein sequences

  1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s Total
H1   1   17 17 14 6 131 105 182 3940 6614 11,027
H2       33 39 20 61 57 134 113 457
H3        27 147 169 348 2040 6440 9171
H4       1   52 51 42 651 408 1205
H5       1 5 21 46 66 1708 1438 3285
H6        5 65 67 91 970 456 1654
H7 1   3 3 1 2 5 33 31 208 679 738 1704
H8        2 3 5 3 113 33 159
H9        1 13 26 90 648 1681 2459
H10      1 1 1 8 28 20 358 239 656
H11       2   23 46 66 279 182 598
H12         9 15 3 126 49 202
H13         7 33 16 91 78 225
H14          2    20 22
H15         5 4   1 2 12
H16         4 11 6 54 102 177
H17            2 1 3
H18             2 2
Total 1 1 3 20 19 54 91 541 700 1198 11,794 18,596 33,018