False extended-spectrum β-lactamase phenotype in clinical isolates of Escherichia coli associated with increased expression of OXA-1 or TEM-1 penicillinases and loss of porins

Abstract excerpt

OBJECTIVES: Two clinical isolates of Escherichia coli, EC18 and EC21, were non-susceptible (MICs 4-16 mg/L) to cefpirome and cefepime, with marked synergy with clavulanate, yet were susceptible to cefotaxime and ceftazidime (MICs ≤ 1 mg/L). EC19, from the same patient as EC21, was susceptible to all four cephalosporins. We sought to characterize the molecular basis of resistance in isolates EC18 and EC21....

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