TABLE 6.

In vitro susceptibilities of E. coli derivatives producing plasmid-encoded AmpC β-lactamases

Antimicrobial agentMIC (μg/ml) for derivatives producing:
ACC-1aACT-1bCMY-1cCMY-2dCFE-1eDHA-1fFOX-1gLAT-1hMIR-1iMOX-1j
Ampicillin2,048>512>1281,000>512
Piperacillin323212864>256128
Temocillin48864
Cephalothin2,048>256128>512
Cefotaxime8≤264162566421286416
Ceftazidime3244128>256648>128128
Cefoxitin4>25625625612812864≥256
Cefotetan2162566432128≥64>512
Cefmetazole128642564≥64512
Moxalactam1820.5164>512
Aztreonam141664641616412816
Cefepime0.25≤0.060.250.510.1251
Cefpirome120.51
Imipenem0.1310.250.50.5≤0.125210.5
Meropenem0.030.060.060.125
  • a See reference 21.

  • b See reference 41.

  • c See reference 23.

  • d See reference 22.

  • e See reference 229.

  • f See reference 98.

  • g See reference 109.

  • h See reference 326.

  • i See reference 248.

  • j See reference 134.