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| NA subtype | Mutation 1) | Type of residue 2) | No. |
| swine N2 | (z) E119G/A/D | F | 1 |
| (z) Q136K | 1 | ||
| (o) D198N | F | 1 | |
| (z) R224K | C | 1 | |
| (o) I314V | 14 | ||
| All | 18 | ||
| environ. N3 | (z) R152K | C | 1 |
| All | 1 | ||
| Total | 19 |
(z) - zanamivir related mutations; (o) - OC related mutation.
C - catalytic residue; F - framework residue.
