AUTHOR=Dortet Laurent , Bonnin Rémy A. , Le Hello Simon , Fabre Laetitia , Bonnet Richard , Kostrzewa Markus , Filloux Alain , Larrouy-Maumus Gerald 

TITLE=Detection of Colistin Resistance in Salmonella enterica Using MALDIxin Test on the Routine MALDI Biotyper Sirius Mass Spectrometer

JOURNAL=Frontiers in Microbiology

VOLUME=11

YEAR=2020

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2020.01141

DOI=10.3389/fmicb.2020.01141

ISSN=1664-302X

ABSTRACT=<p>Resistance to polymyxins in most Gram-negative bacteria arises from chemical modifications to the lipid A portion of their lipopolysaccharide (LPS) mediated by chromosomally encoded mutations or the recently discovered plasmid-encoded <italic>mcr</italic> genes that have further complicated the landscape of colistin resistance. Currently, minimal inhibitory concentration (MIC) determination by broth microdilution, the gold standard for the detection of polymyxin resistance, is time consuming (24 h) and challenging to perform in clinical and veterinary laboratories. Here we present the use of the MALDIxin to detect colistin resistant <italic>Salmonella enterica</italic> using the MALDxin test on the routine matrix-assisted laser desorption ionization (MALDI) Biotyper Sirius system.</p>