Table 1. MICs for various β-lactams with B. thailandensis strains.
Strain | MIC (µg/ml)a | |||
AMX/CLA | CTXM | CRX | CEF | |
Wild type | ||||
E264 (penA-WT) | 6 | 6 | 16 | 18 |
Mutant | ||||
E264 (penA-TR10) | 3 | 1.5 | 1 | 8 |
E264 (penA-TR11) | 3 | 1.625 | 0.5 | 12 |
penA -null mutant strains | ||||
E264 (ΔpenA-WT) | 1.5 | 1 | 0.5 | 3 |
E264 (ΔpenA-TR10) | 2 | 0.75 | 0.25 | 6 |
E264 (ΔpenA-TR11) | 2 | 1 | 0.38 | 6 |
penA -null mutants complemented by penA alleles carried by pRK415K | ||||
E264 (ΔpenA-WT, complemented) | 48 | >32 | >32 | 64 |
E264 (ΔpenA-TR10, complemented) | 2.5 | 3 | 2 | 24 |
E264 (ΔpenA-TR11, complemented) | 3 | 4.5 | 4 | 40 |
aMICs were measured by the E-test.
Abbreviations: AMX, amoxicillin; CLA, clavulanic acid; CTXM, cefotaxime; CRX, ceftriaxone; CEF, cefepime.