TABLE 2.

MICs of β-lactams for E. persicina reference strain 105199T, E. coli DH10B(pSV-1), and E. coli DH10B reference strain

β-Lactam(s)bMIC (μg/ml)a
E. persicina 105199TE. coli DH10B(pSV-1)E. coli DH10B
Amoxicillin256>5122
Amoxicillin + CLA0.582
Ticarcillin64>5121
Ticarcillin + CLA0.5641
Piperacillin45121
Piperacillin + TZB0.2521
Cephalothin16>5122
Cefsulodin32>51216
Cefuroxime0.121282
Cefotaxime0.061<0.06
Cefotaxime + CLA<0.060.06<0.06
Cefotaxime + TZB<0.060.06<0.06
Ceftazidime<0.060.25<0.06
Ceftazidime + CLA<0.060.06<0.06
Ceftazidime + TZB<0.060.06<0.06
Ceftriaxone0.064<0.06
Cefepime<0.061<0.06
Cefpirome<0.061<0.06
Cefoxitin122
Moxalactam0.060.250.12
Aztreonam0.1240.06
Imipenem0.060.120.06
  • a E. persicina 105199T and E. coli DH10B(pSV-1) produced β-lactamase ERP-1.

  • b CLA, clavulanic acid at a fixed concentration of 2 μg/ml; TZB, tazobactam at a fixed concentration of 4 μg/ml.