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Two Klebsiella pneumoniae strains selected according to their high cross-resistance pattern to cephalosporins were characterized by (i) outer membrane protein content such as OmpA or nonspecific porins, (ii) MICs of various cephalosporins and unrelated antibiotics, (iii) β-lactamase production, and (iv) active efflux of fluoroquinolones. An association of porin deficiency and β-lactamase production...
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