Keywords :
Antimicrobial resistance; Carbapenemases; Evolution; Extended-spectrum β-lactamases; Gram-negative bacteria; AmpC beta lactamases; AmpC beta-lactamases; Enterobacteriaceae; Review; Bacteria; Bacterial Proteins; Carbapenems; Cephalosporins; Evolution, Molecular; Mutation
Abstract :
[en] Production of β-lactamases is one of the most common mechanisms of bacterial resistance to β-lactam antibiotics. In the clinical setting, the introduction of new classes of β-lactams has invariably been followed by the emergence of new β-lactamases capable of degrading them, as a paradigmatic example of rapid bacterial evolution under a rapidly changing selective environment. The scope of this article is to provide an overview on the recent evolution of β-lactamase-mediated resistance among bacterial pathogens. Focus is on the mechanisms of evolution and dissemination of enzymes of greater clinical impact, including the extended-spectrum β-lactamases, the AmpC-type β-lactamases and the carbapenemases, which are currently responsible for emerging resistance to the most recent and powerful β-lactams (the expanded-spectrum cephalosporins and the carbapenems) among major Gram-negative pathogens such as Enterobacteriaceae, Pseudomonas aeruginosa and Acinetobacter. © 2006 Future Medicine Ltd.
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