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Survival of BALB/c mice infected with different doses of PR8/NA-F85–93 or PR8/NA-HA518–526 or with wild-type PR8 virus
| Infectious dose (PFU) | No. of survivors/total no. | |
|---|---|---|
| Wild-type PR8 | 103 | 3/3 |
| 104 | 0/3 | |
| PR8/NA-F85–93 | 102 | 4/4 |
| 103 | 4/4 | |
| 104 | 3/6 | |
| PR8/NA-HA518–526 | 102 | 4/4 |
| 103 | 4/4 | |
| 104 | 2/6 |
