ArticleJournal of clinical microbiology2026
Evaluation of carbapenem inactivation method-based phenotypic assays for the detection of GES-type carbapenemases in Enterobacterales,
Article in Journal of clinical microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Detection of GES-type carbapenemases remains challenging because of their low prevalence and frequently weak hydrolytic activity against carbapenems. Carbapenem inactivation method (CIM)-based assays are widely used as phenotypic screening tools for carbapenemase detection; however, their performance in large collections of GES producers has not been systematically evaluated. We assessed the performance of CIM, modified CIM (mCIM), and CIM-Tris in a diverse collection of GES-producing clinical isolates, including 110 Enterobacterales and 108 IMPORTANCE: GES-type carbapenemases represent an important but underrecognized diagnostic challenge due to their low global prevalence, heterogeneous hydrolytic activity, and the limited performance data available for routine phenotypic detection methods. Although CIM-based assays are widely implemented in clinical microbiology laboratories for carbapenemase screening, their performance against GES-producing organisms has not been comprehensively evaluated across different bacterial genera and GES variants. In this study, we evaluated the performance of CIM, modified CIM (mCIM), and CIM-Tris in a large multicenter collection of well-characterized GES-producing clinical isolates, including Enterobacterales,
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