Table 2.

MICs of β-lactam drugs for S. typhimuriumclinical isolates and E. coli derivatives

StrainMIC (μg/ml)a
AMPAMCSAMTICTIMPIPPTZCAZCTXATMIPMFOX
S. typhimurium strains
 28>1281664>128128>12828128320.252
 34>1283264>128>128>128648128320.252
E. coli strains
 DH5α8884110.250.25≤0.12≤0.120.258
 DH5α/pCLL23008884110.250.25≤0.12≤0.120.258
 DH5α/pCLL3422 + pCLL2300>1286432>128128128810.50.50.58
 DH5α/pCLL3425>1283232>128128>128116>1281280.516
 DH5α/pCLL3417>1283264>128128>1280.516>1281280.58
  • a MICs were determined in broth microdilution tests (21). AMP, ampicillin; AMC, amoxicillin-clavulanate; SAM, ampicillin-sulbactam; TIC, ticarcillin; TIM, ticarcillin-clavulanate; PIP, piperacillin; PTZ, piperacillin-tazobactam; CAZ, ceftazidime; CTX, cefotaxime; ATM, aztreonam; IPM, imipenem; FOX, cefoxitin.