Table 3.

MICs of β-lactam antibiotics for various strains studied

β-LactamMIC (μg/ml)
C. sedlakii 2596E. coli Top10 (pBC2596)E. coli Top10aC. sedlakiiCIP-105037bC. koseriCK1c
Amoxicillin>512>5122>51264
Amoxicillin + CLAd 8512281
Ticarcillin>512>512151264
Piperacillin8128228
Cephalothin256>51212562
Cephalothin + CLA4114NDf
Cefuroxime64>5124324
Cefuroxime + FOXe 256NDND256ND
Cefoxitin42242
Cefotaxime0.252<0.125<0.125<0.125
Aztreonam216<0.1251<0.125
  • a Reference strain.

  • b Reference strain from CIP.

  • c A wild-type strain.

  • d CLA, clavulanic acid at a fixed concentration of 4 μg/ml.

  • e FOX, cefoxitin at a fixed concentration of 2 μg/ml.

  • f ND, not determined.