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LD50 of the parental strain and the adapted strains.
| Bacterial strain | LD50 |
|---|---|
| DN13a | >107 CFU |
| SS9-P10 | 5.3 × 104 CFU |
| SS9-P20 | 7.1 × 104 CFU |
| SS9-P30 | 3.2 × 104 CFU |
Before passaging, a group of mice (n = 5) were challenged with 107 CFU/mouse and no death was observed and therefore LD50 was viewed as high than 107 CFU.
