Table 1. Sequences by host species and subtype used in the initial analysis.
| Host | H1N1 | H1N2 | H2N2 | H3N1 | H3N2 | Total |
| Avian | 30 | 2 | 6 | 0 | 16 | 54 |
| Human | 86 | 2 | 21 | 0 | 114 | 223 |
| Swine | 62 | 17 | 0 | 0 | 23 | 102 |
| COSI swine complete | 46 | 16 | 0 | 0 | 7 | 69 |
| COSI swine partial | 6 | 6 | 0 | 2 | 4 | 18 |
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