Table 2. Attenuated virulence of internalin mutants in DBA/2J mice.
| Strain | LD50 |
| wild-type | 7.5×103 |
| Δ0552 | 8.4×105 |
| Δ1346 | 4.7×105 |
| Δ0552, 1346 | 1.2×106 |
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