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Mar
2012

Extended-spectrum-beta-lactamase (ESBL)-producing members of the Enterobacteriaceae are often resistant to multiple drug classes, making therapy of urinary infections with oral antibiotics difficult. Previously it was shown that amoxicillin-clavulanate can provide clavulanate inhibition of ESBLs and protect an oral cephalosporin present in combination when tested by broth microdilution. This study has shown that disk approximation testing could detect favorable cephalosporin-clavulanate interactions among a group of 101 previously characterized members of the Enterobacteriaceae with CTX-M, SHV, or TEM ESBLs.

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Jan
2008

Clavulanate is a highly effective inhibitor of extended-spectrum beta-lactamases (ESBLs) in detection tests, but the commercial amoxycillin-clavulanate and ticarcillin-clavulanate combinations have borderline activity, at best, against most ESBL producers. Oxyimino-cephalosporin-clavulanate combinations are active in vitro against most ESBL-producing Escherichia coli and Klebsiella spp. isolates at < or =1-2 mg/L but are compromised against Enterobacter spp.

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Jul
2004

In this study, we evaluated the performance of a new ESBL Etest configuration based on clavulanate synergy with cefepime compared with cefotaxime-clavulanate and ceftazidime-clavulanate ESBL Etest strips for the detection of extended-spectrum beta-lactamases (ESBL) in an Enterobacteriaceae strain collection, with special focus on Enterobacter spp.
Overall, a total of 54 clinical isolates of ESBL-producing Enterobacteriaceae species were evaluated: Enterobacter aerogenes (n=3), Enterobacter cloacae (n=10), Escherichia coli (n=10), Klebsiella oxytoca (n=3), Klebsiella pneumoniae (n=25) and Proteus mirabilis (n=3). To check Etest behaviour with resistance phenotypes similar to ESBL, our panel was expanded by six clinical isolates of K.

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Jan
2008

Strains of Enterobacteriaceae producing an extended spectrum beta-lactamase have become a concern in medical bacteriology as regards both antimicrobial treatment and infection control in hospitals. Extended-spectrum beta-lactamase (ESBL) detection tests should accurately discriminate between bacteria producing these enzymes and those with other mechanisms of resistance to beta-lactams, e.g.

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