Validation of a screening method for the detection of colistin-resistant E. coli containing mcr-1 in feral swine feces

Journal of Microbiological Methods
By: , and 

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Abstract

A method was developed and validated for the detection of colistin-resistant Escherichia coli containing mcr-1 in the feces of feral swine. Following optimization of an enrichment method using EC broth supplemented with colistin (1 µg/mL) and vancomycin (8 µg/mL), aliquots derived from 100 feral swine fecal samples were spiked with of one of five different mcr-1 positive E. coli strains (between 100 and 104 CFU/g), for a total of 1,110 samples tested. Enrichments were then screened using a simple boil-prep and a previously developed real-time PCR assay for mcr-1 detection. The sensitivity of the method was determined in swine feces, with mcr-1 E. coli inoculums of 0.1-9.99 CFU/g (n = 340), 10-49.99 CFU/g (n = 170), 50-99 CFU/g (n = 255), 100-149 CFU/g (n = 60), and 200-2,200 CFU/g (n = 175), which were detected with 32%, 72%, 88%, 95%, and 98% accuracy, respectively. Uninoculated controls (n = 100) were negative for mcr-1 following enrichment.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Validation of a screening method for the detection of colistin-resistant E. coli containing mcr-1 in feral swine feces
Series title Journal of Microbiological Methods
DOI 10.1016/j.mimet.2020.105892
Volume 172
Year Published 2020
Language English
Publisher Elsevier
Contributing office(s) Alaska Science Center Biology WTEB
Description 105892, 5 p.
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