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| Gene/Protein (no. of sequences analyzed) | Maximum Kimura 2P genetic distance (nt level), % | Maximum Poisson correction genetic distance (aa level), % |
| PB2 (53)1 | 1.1 | 1.6 |
| PB1 (57)1 | 1.7 | 1.8 |
| PB1-F2 (49) | - | 6.0 |
| PA (58)1 | 1.0 | 1.4 |
| HA (59) | 1.2 | 1.7 |
| NP (59) | 0.7 | 0.4 |
| NA (59) | 0.9 | 1.3 |
| NS (57) | 1.2 | - |
| NS1 (57) | - | 2.0 |
| NS2 (57) | - | 2.0 |
| M (59) | 0.7 | - |
| M1 (59) | - | 0.8 |
| M2 (59) | - | 2.1 |
Partial sequences were included in the analysis of PB2, PB1, and PA genes.
