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Applied and Environmental Microbiology, December 2002, p. 6405-6409, Vol. 68, No. 12
0099-2240/02/$04.00+0 DOI: 10.1128/AEM.68.12.6405-6409.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
Canadian Research Institute for Food Safety,1 Department of Food Science, University of Guelph, Guelph, Ontario, Canada N1G 2W12
Received 22 February 2002/ Accepted 24 August 2002
Nineteen Listeria monocytogenes strains were characterized by automated ribotyping, pulsed-field gel electrophoresis, and plasmid profiling to determine the relationship between genotype and sanitizer resistance. Isolates within a ribogroup had a consistent sensitivity or resistance phenotype except for ribogroup C isolates. All isolates with resistance phenotypes harbored two plasmids. The sensitivity of L. monocytogenes strains to quaternary ammonium compounds (QACs) was correlated with sensitivity to sanitizers and antibiotics with other modes of action. All isolates tested contained the mdrL gene, which encodes an efflux pump that confers resistance to QACs and is both chromosome and plasmid borne.
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