Table 3.

MICs for representative E. coli XL1-blue transformants with ampicillin resistance cloned from isolates 871 and 873

Plasmid and β-lactamase transformantaMIC (μg/ml)b
AmpPipPip-ClavPip-TazCbCb-ClavCb-TazCazCaz-ClavCaz-TazCtxCtrCslCpimCpzMoxAztImp
p15C/OXA-17 from isolate 871512812512641280.50.250.50.51640.516110.06
p13E/OXA-17 from isolate 8735128145126425610.50.50.51640.516210.12
p15A/OXA-2 from isolate 871256160.120.255128410.250.250.120.06320.1280.250.060.06
p13A/OXA-2 from isolate 87312820.50.251288410.120.50.060.6160.1220.120.120.06
XL1-blue(p10A)/OXA-1051216181,0241281280.250.120.250.120.5320.2580.2510.06
XL1-blue (no plasmid)40.250.120.128480.250.120.250.060.06160.120.120.120.120.06
  • a Into E. coli XL1-blue.

  • b Amp, ampicillin; Azt, aztreonam; Cb, carbenicillin; Clav, clavulanate at 4 μg/ml; Cpim, cefepime; Cpz, cefoperazone; Csl, cefsulodin; Ctx, cefotaxime; Caz, ceftazidime; Ctr, ceftriaxone; Imp, imipenem; Mox, moxalactam (latamoxef); Pip, piperacillin and Taz, tazobactam at 4 μg/ml.