EDTA-modified carbapenem inactivation method: A phenotypic method for detecting metallo-β-lactamase-producing enterobacteriaceae

M. M. Sfeir, J. A. Hayden, K. A. Fauntleroy, C. Mazur, J. K. Johnson, P. J. Simner, S. Das, M. J. Satlin, S. G. Jenkins, L. F. Westblade

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


The increase in the prevalence and impact of infections caused by carbapenemase-producing Enterobacteriaceae is a global health concern. Therefore, rapid and accurate methods to detect these organisms in any clinical microbiology laboratory, including those in resource-limited settings, are essential to prevent and contain their spread. It is also important to differentiate between serine- and metaldependent carbapenemases elaborated by carbapenemase-producing isolates for epidemiologic, infection control and prevention, and therapeutic purposes. Here, we describe the development and evaluation of the EDTA-modified carbapenem inactivation method (eCIM), an assay for discriminating between serine- and metaldependent (i.e., metallo-β-lactamases [MBLs]) carbapenemases when used in conjunction with the modified carbapenem inactivation method (mCIM). The eCIM had an overall sensitivity and specificity of 100% and was adopted by the Clinical and Laboratory Standards Institute as a method to use in combination with the mCIM to identify MBL-producing Enterobacteriaceae.

Original languageEnglish (US)
Article numbere01757-18
JournalJournal of clinical microbiology
Issue number5
StatePublished - May 2019


  • Carbapenemase
  • Carbapenemase-producing Enterobacteriaceae
  • ECIM
  • EDTA-modified carbapenem inactivation method
  • MBL
  • MCIM
  • Metallo-β-lactamase
  • Modified carbapenem inactivation method
  • Phenotypic detection

ASJC Scopus subject areas

  • Microbiology (medical)


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