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Comparison of two chromogenic media for the detection of vancomycin-resistant enterococcal carriage by nursing home residents.

Published version
Peer-reviewed

Repository DOI


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Authors

Gouliouris, Theodore 
Blane, Beth 
Brodrick, Hayley J 
Raven, Kathy E 
Ambridge, Kirsty E 

Abstract

We compared ChromID VRE and Brilliance VRE media for the detection of vancomycin-resistant enterococci (VRE). Using a panel of 28 enterococcal isolates, 10 vanA Enterococcus faecium and three vanA Enterococcus faecalis isolates grew as per manufacturers' instructions whilst growth of two vanC and eight vancomycin-susceptible enterococci was inhibited on both media. Important differences were noted in the selectivity and chromogenic properties of the two media for vanA Enterococcus raffinosus and vanB E. faecium. The two media were further evaluated using 295 stool samples from nursing home residents, 34 of which grew VRE (11.5%). ChromID and Brilliance had comparable sensitivity, which was increased markedly by prolonging incubation to 48 hours (from 29% to 82%, and from 41% to 85%, respectively) and by a pre-enrichment step (to 97% and 100%, respectively). Brilliance VRE agar had higher selectivity at 48 hours, and after pre-enrichment.

Description

Keywords

Detection, Enterococcus faecium, Selectivity, Sensitivity, VRE, Vancomycin-resistant enterococci, Bacteriological Techniques, Carrier State, Chromogenic Compounds, Culture Media, Enterococcus faecalis, Enterococcus faecium, Feces, Gram-Positive Bacterial Infections, Humans, Nursing Homes, Prospective Studies, Sensitivity and Specificity, Vancomycin-Resistant Enterococci

Journal Title

Diagn Microbiol Infect Dis

Conference Name

Journal ISSN

0732-8893
1879-0070

Volume Title

85

Publisher

Elsevier BV
Sponsorship
Academy of Medical Sciences (unknown)
Medical Research Council (MR/N029399/1)
Wellcome Trust (098600/Z/12/Z)
National Institute for Health and Care Research (HICF-T5-342)
This publication presents independent research supported by the Health Innovation Challenge Fund (WT098600, HICF-T5-342), a parallel funding partnership between the Department of Health and Wellcome Trust. The views expressed in this publication are those of the author(s) and not necessarily those of the Department of Health or Wellcome Trust. TG is a Wellcome Trust Research Training Fellow. MET is a Clinician Scientist Fellow supported by the Academy of Medical Sciences and the Health Foundation. SJP and MET are supported by the NIHR Cambridge Biomedical Research Centre.