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Immune effect of the mutant strain ΔsprT.
| Group | Inoculation type | Survival of ducks/total ducks |
Protection rates (%) |
||
|---|---|---|---|---|---|
| 2 LD50 | 10 LD50 | 2 LD50 | 10 LD50 | ||
| 1 | ΔsprT (4 × 105 CFU) | 6/10 | 7/10 | 60 | 70 |
| 2 | ΔsprT (2 × 106 CFU) | 8/10 | 6/8 | 80 | 75 |
| 3 | ΔsprT (1 × 107 CFU) | 9/9 | 8/9 | 100 | 88.9 |
| 4 | PBS (negative control) | 1/10 | 0/10 | 10 | 0 |
| 5 | Oil-inactivated vaccine (5 × 109 CFU) | 8/10 | 7/10 | 80 | 70 |
