| Viruses | IC 50 range (nM)* | |
| Oseltamivir | Zanamivir | |
| Seasonal A (H1N1) | 0.4 - 10 | 0.3 - 1 |
| Seasonal A (H1N1) (H275Y) | 257 - 3455 | 0.3 - 2 |
| Pandemic A (H1N1) | 0.2 - 10 | 0.2 - 1 |
| Pandemic A (H1N1) (H275Y) | 132 - 2179 | 0.2 - 2 |
| Type B | 8 - 128 | 0.5 - 12 |
| Type B (D197E) | 79 - 966 | 3 - 290 |