Table 3.

MICs for E. coli isolates

E. coli isolateMIC (μg/ml)a
AmpPipPip/tazoCTAZCTXCFTICFOXCPIMTetT/SGentCiproStrepcChlorcSulfc
9>163216>1632>8>321>8>110.03666
DH10B 9b >166416>16>32NTd >321≤4≤0.50.5≤0.0156628
164>16>128>64>16>32>8>322>8>180.03666
DH10B 164>16>128>64>16>32NT>322>8>10.25≤0.015666
279>16>128161682>320.25>8>1>16>2666
DH10B 279>16>12816>1616NT>320.5>8≤0.516≤0.015666
292>16>12816>1632>8>320.5>8>1>16>2666
DH10B 292>1612816>16>32NT>321>8≤0.5>16≤0.0156634
321>16>1288>16328>320.5>8>116≤0.015666
DH10B 321>16>12816>16>32NT>321>8>116≤0.0156146
665>16>128161616>8>321>8>18>2666
DH10B 665>16>12832>1632NT>322>8>116≤0.015666
725>16>12816>1632>8>324>8>11>2666
DH10B 725>16>12832>16>32NT>324>8≤0.51≤0.015666
771>16>1288816>8>321>8>18≤0.015666
DH10B 771>16>128161632NT>321>8≤0.58≤0.015666
Human 109>16>1288>1632>8>321>8>1>16>2611.66
DH10B H109>16>1288>1632NT>320.25>8≤0.50.5≤0.015666
Human 826>1612881688>320.5>8>1>16>2666
DH10B H826>161288>1616NT>320.5>8>10.25≤0.015666
DH10B4420.5≤0.25NT8≤0.12≤4≤0.50.5≤0.01562222
  • a Amp, ampicillin; Pip, piperacillin; Pip/tazo, Piperacillin combined with a fixed concentration of tazobactam (4 μg/ml); CTAZ, ceftazidime; CTX, ceftriaxone; CFTI, ceftiofur; CFOX, cefoxitin; CPIM, cefepime; Tet, tetracycline; T/S, trimethoprim-sulfamethoxazole; Gent, gentamicin; Strep, streptomycin; Chlor, chloramphenicol; Sulf, sulfisoxazole; Cipro, ciprofloxacin.

  • b E. coli DH10B transformants carrying the CMY-2 plasmid from the corresponding isolate.

  • c Antimicrobial susceptibility determined by disk methodology.

  • d NT, not tested.