What are the guidelines for presumptive identification and confirmation of extended-spectrum beta-lactamases (ESBLs) for the treatment of Enterobacter infections?

Updated: Jun 18, 2019
  • Author: Susan L Fraser, MD; Chief Editor: Michael Stuart Bronze, MD  more...
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The CLSI has published guidelines for presumptive identification and for confirmation of ESBL production by Klebsiella and E coli, guidelines that are often applied to other Enterobacteriaceae. From the above, one can conclude that, when a bacterium of the genus Enterobacter produces ESBL(s) (more than 1 ESBL can be produced by the same bacteria), it does so in addition to the AmpC beta-lactamases that are always present, either in states of inducibility or in states of stable derepression. With stable derepressed mutants, additional ESBL and carbapenemase detection laboratory methods have been published by the CLSI. [35]

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