Use of Faropenem as an Indicator of Carbapenemase Activity in the Enterobacteriaceae

Day, Kathryn, Pike, Rachel, Winstanley, Trevor, Lanyon, Clare, Cummings, Stephen, Raza, Muhammad, Woodford, Neil and Perry, John (2013) Use of Faropenem as an Indicator of Carbapenemase Activity in the Enterobacteriaceae. Journal of Clinical Microbiology, 51 (6). pp. 1881-1886. ISSN 0095-1137

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Abstract

The aim of this study was to determine the ability of a disc susceptibility test using faropenem (10 μg) to predict carbapenemase activity in Enterobacteriaceae. A collection of 166 isolates of carbapenemase-producing Enterobacteriaceae (CPE) and 82 isolates of Enterobacteriaceae that produced other β-lactamases was compiled from diverse sources. Disc susceptibility testing was performed using the CLSI/EUCAST methodology with discs of faropenem (10 μg), temocillin (30 μg), and four carbapenems (each 10 μg). A further prospective evaluation of the faropenem disc susceptibility test was performed using 205 consecutive isolates referred to a United Kingdom reference laboratory in parallel with molecular methods for carbapenemase detection. Of 166 isolates of CPE, 99% showed growth up to the edge of a 10-μg faropenem disc compared with only 6% of other β-lactamase producers (sensitivity, 99%; specificity, 94%). A “double zone” around 10-μg faropenem discs was frequently associated with OXA-48 producers. Of the carbapenems, the most useful agent was imipenem, where a zone diameter of ≤23 mm as a predictor of carbapenemase activity had a sensitivity of 99% and a specificity of 85%. The presence of no zone of inhibition around a 30-μg temocillin disc was a consistent feature of strains producing OXA-48 carbapenemase. For 205 isolates of Enterobacteriaceae referred to a United Kingdom reference laboratory, growth up to a 10-μg faropenem disc correctly identified 84 of 86 carbapenemase producers (98% sensitivity), with a specificity of 87%. Disc susceptibility testing using faropenem (10 μg) is a simple, convenient, and highly predictive screening test for carbapenemase-producing Enterobacteriaceae.

Item Type:	Article
Subjects:	C500 Microbiology
Department:	Faculties > Health and Life Sciences > Applied Sciences
Depositing User:	Ellen Cole
Date Deposited:	26 Jul 2013 11:14
Last Modified:	12 Oct 2019 18:28
URI:	http://nrl.northumbria.ac.uk/id/eprint/13283

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