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The LD50 of strains APEC94 and APEC94Δlsr(Cm)
| APEC strains | Challenge dosage | No. of ducks | Mortality | Living No. | Mortality rate (%) | LD50 (CFU) |
|---|---|---|---|---|---|---|
| APEC94 | 109 | 8 | 8 | 0 | 100 | 8.66 × 105 |
| 108 | 8 | 7 | 1 | 87.5 | ||
| 107 | 8 | 7 | 1 | 87.5 | ||
| 106 | 8 | 4 | 4 | 50 | ||
| 105 | 8 | 2 | 6 | 25 | ||
| APEC94Δlsr(Cm) | 109 | 8 | 7 | 1 | 87.5 | 2.55 × 108 |
| 108 | 8 | 2 | 6 | 25 | ||
| 107 | 8 | 1 | 7 | 12.5 | ||
| 106 | 8 | 0 | 8 | 0 | ||
| 105 | 8 | 0 | 8 | 0 |
