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| Virus | Species | Culture1 | PB2 | NS1 |
| Ch/H9N2 | Homing pigeon | TOC | E472K, L571I | V18I |
| EF | I382T, E472K, L571I | |||
| Turkey | TOC | E472K, L571I | ||
| EF | E472K, L571I | V18I | ||
| Chicken | TOC | E472K, L571I | ||
| EF | E472K, L571I | |||
| Pekin duck | TOC | E472K, L571I | ||
| EF | E472K, L571I |
TOC: Tracheal organ culture; EF: Embryo fibroblast culture.
