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Appl. Environ. Microbiol., Feb 1996, 705-711, Vol 62, No. 2
Copyright © 1996, American Society for Microbiology

Use of molecular typing methods to trace the dissemination of Listeria monocytogenes in a shrimp processing plant [published erratum appears in Appl Environ Microbiol 1996 May;62(5):1852-3]

MT Destro, MF Leitao and JM Farber
Health Canada, Banting Research Centre, Ottawa, Ontario, Canada. mtdestro@Fox.cce.usp.br

Molecular typing of bacteria has been widely used in epidemiological studies but not as extensively for tracing the transmission of pathogenic bacteria in food plants. This study was conducted to examine the potential use of two molecular typing methods, random amplified polymorphic DNA (RAPD) analysis and pulsed-field gel electrophoresis (PFGE), to trace Listeria monocytogenes contamination in a shrimp processing plant. Ribotyping and phase typing were also performed on a select number of strains. One hundred fifteen strains of L. monocytogenes collected in different areas of a shrimp processing plant were first serotyped and then subtyped by molecular typing. RAPD and PFGE showed great promise for typing L. monocytogenes isolates since distinguishable and reproducible DNA polymorphisms were obtained. When the composite profile from both (RAPD and PFGE) methods was generated, there was an increase in the discriminatory power to discern differences between strains of L. monocytogenes. The results indicated that environmental strains all fell into composite profile groupings unique to the environment, while strains from both water and utensils shared another composite profile group. L. monocytogenes fresh shrimp isolates belonging to one profile group were found in different areas of the processing line. This same profile group was also present in food handlers from the processing and packaging areas of the plant.


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