Article (Scientific journals)
Assessment of two selective agar media to isolate colistin-resistant bovine Escherichia coli: Correlation with minimal inhibitory concentration and presence of mcr genes
Thiry, Damien; Berrah, Anis; Evrard, Julien et al.
2019In Journal of Microbiological Methods, 159, p. 174-178
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Keywords :
Cattle; Colistin resistance; Disk diffusion assay; Escherichia coli; Minimal inhibitory concentration; Selective agar
Abstract :
[en] The identification of colistin-resistant enterobacteria in veterinary medicine is impaired by the absence of first-line reliable phenotypic assay. The purpose of this study was to assess two selective agar media for the detection of colistin-resistant bovine pathogenic Escherichia coli. A total of 158 E. coli (46 R <resistant>, 96 I <intermediate> and 16 S <sensitive> at the disk diffusion assay) isolated between 2013 and 2018 from <3 month-old calves suffering enteritis or septicaemia, were (i) tested by the broth dilution assay to determine colistin Minimal Inhibitory Concentrations (MIC); (ii) streaked on CHROMID® Colistin_R and CHROMagar™ COL-APSE agar plates; (iii) submitted to a pentaplex PCR to identify the presence of mcr-1 to mcr-5 genes. Of the 92 E. coli growing on both agar media, 90 had a MIC > 2.0 μg/ml as had the 3 E. coli that grew only on the CHROMID® Colistin_R agar medium and one E. coli that grew on neither agar media. Therefore, the positive predictive values of the CHROMID® Colistin_R and CHROMagar™ COL-APSE agar media were both 0.98 whereas their negative predictive values were 0.98 and 0.94, respectively. Also noteworthy 43 of the 46 R isolates had a MIC > 2.0 μg/ml and grew on both selective media as did half of the 96 I isolates and only 1 of the S isolates. Conversely, only 30 of the 90 isolates that grew on both agar media and with a MIC > 2.0 μg/ml tested positive for the mcr-1 or mcr-2 genes with the pentaplex PCR. These two selective agar media can be used to reliably detect colistin-resistant E. coli. Positive growth was highly correlated with R results at the disk diffusion assay, but not with the presence of mcr genes. Copyright © 2019. Published by Elsevier B.V.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Thiry, Damien  ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires (DMI) > Bactériologie et pathologie des maladies bactériennes
Berrah, Anis ;  Bacteriology, Department of Infectious Diseases, Faculty of Veterinary Medicine, FARAH (Fundamental and Applied Research for Animals and Health) Centre, University of LiègeLiège B-4000, Belgium
Evrard, Julien
Duprez, Jean-Noël  ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires (DMI) > Département des maladies infectieuses et parasitaires (DMI)
Mainil, Jacques  ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires (DMI) > Bactériologie et pathologie des maladies bactériennes
Saulmont, Marc;  ARSIA (Association Régionale de Santé et d'Identification Animale), Ciney B5590, Belgium
Language :
English
Title :
Assessment of two selective agar media to isolate colistin-resistant bovine Escherichia coli: Correlation with minimal inhibitory concentration and presence of mcr genes
Publication date :
2019
Journal title :
Journal of Microbiological Methods
ISSN :
0167-7012
eISSN :
1872-8359
Publisher :
NLM (Medline)
Volume :
159
Pages :
174-178
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 May 2019

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