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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.

Sensitivity of Listeria monocytogenes to Sanitizers Used in the Meat Processing Industry

Nadya Romanova,1 Stacy Favrin,1,2 and Mansel W. Griffiths1,2*

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.


* Corresponding author. Mailing address: Canadian Research Institute for Food Safety, University of Guelph, Guelph, ON, Canada N1G 2W1. Phone: (519) 824-4120, ext. 2269. Fax: (519) 763-0952. E-mail: mgriffit{at}uoguelph.ca.


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.




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