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| Virussubtype | Sequences evaluated | PB1 proteins with mutations in | ||||
| motif I | motif II | motif III | motif IV | Total | ||
| H5N1 | 1562 (25%*) | 5 | 2 | 15 | 28 | 50 (42%*) |
| H9N2 | 774 (13%*) | 0 | 4 | 9 | 15 | 28 (23%*) |
| H7Nx | 626 (10%*) | 1 | 1 | 1 | 1 | 4 (3%*) |
| H6Nx | 663 (11%*) | 1 | 1 | 1 | 5 | 8 (7%*) |
| All Other | 2563 (41%*) | 1 | 11 | 10 | 8 | 30 (25%*) |
| Total | 6188 (100%) | 8 | 19 | 36 | 57 | 120 (100%) |
Percentage of total changes.
