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. 2004 Apr;48(4):1374–1378. doi: 10.1128/AAC.48.4.1374-1378.2004

TABLE 1.

MICs of β-lactams for clinical strain AJC68081, E. coli TG1, E. coli TG1 (pBE-1), and E. coli TG1 (pGER1)

Antibiotic MIC (μg/ml)a
AJC68081 (produces AmpC of AG3) E. coli TG1 E. coli TG1 (pBE-1)b E. coli TG1 (pGER1)c
Amoxicillin >256 3 256 128
Amoxicillin + clavulanated 6 2 24 32
Piperacillin >256 0.38 64 8
Cephalothin >256 3 >256 >256
Cefuroxime >256 1.5 >256 >256
Cefoxitin >256 2 128 2
Cefotaxime 256 0.023 2 4
Cefotaxime + clavulanated 0.19 0.023 1 1
Ceftazidime 32 0.064 0.75 16
Ceftazidime + clavulanated 0.19 0.064 0.5 8
Cefepime 32 0.016 0.047 0.25
Aztreonam 12 0.032 0.25 1
Imipenem 1 0.125 0.38 0.125
Meropenem 0.75 0.008 0.023 0.012
Clavulanic acid 8-16 ND ND ND
Sulbactam 16-32 ND ND ND
a

ND, not done.

b

Transformant producing AmpC β-lactamase of AG3.

c

Transformant producing AmpC β-lactamase of A. baumannii.

d

Clavulanate was used at 4 μg/ml.