Typing of Listeria Monocytogenes Isolated from Slaughtered Cattle and Beef Meat

Katarzyna Dmowska; Kinga Wieczorek; Orla Lynch; Jacek Osek

doi:10.2478/bvip-2013-0033

Abstract

A total of 135 L. monocytogenes strains isolated from slaughtered cattle and beef meat were tested by the pulsed field gel electrophoresis (PFGE). The AscI restriction analysis revealed a genetic heterogeneity among investigated isolates since 31, 9, and 35 profiles were distinguished among hide, carcass, and meat strains, respectively. The PFGE profiles of the isolates were also analysed in relation to serotypes, virulence genes, and antimicrobial resistance. It was shown that strains displaying the same PFGE type were of the same serotype while correlation between pulsotype and antimicrobial resistance was poor. The obtained results suggest that a cross-contamination between bovine hides and carcasses may occur during the slaughter process. Moreover, identification of identical PFGE types among L. monocytogenes found during a study period may suggest a common source of contamination or presence of persistent strains able to survive for a long time. These results emphasise the importance of molecular subtyping methods, including PFGE, in monitoring and tracking pathogen contamination along food chain.

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Typing of Listeria Monocytogenes Isolated from Slaughtered Cattle and Beef Meat

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