TABLE 2.

MICs of various β-lactams with and without clavulanic acid for the strains tested

AntibioticMIC (μg/ml)
K. pneumoniae BM4493E. coli JM83/ pIP843E. coli JM83
Amoxicillin>256>2564
Piperacillin2562561
Piperacillin-CLAa421
Cefalothin>256>2562
Cefuroxime>2562562
Cefoxitin441
Cefoxitin-CLA221-2
Cefotaxime64128<0.125
Cefotaxime-CLA0.50.5<0.125
Ceftazidime84<0.125
Ceftazidime-CLA0.250.25<0.125
Aztreonam1616<0.125
  • a CLA, clavulanic acid at a fixed concentration of 2 μg/ml.