Abstract

MARZOCCA, M.A.; MARUCCI, P.L.; SICA, M.G.  and  ALVAREZ, E.E.. Listeria monocytogenes detection in different food products and environmental samples of supermarkets of Bahía Blanca city (Argentine). Rev. argent. microbiol. [online]. 2004, vol.36, n.4, pp.179-181. ISSN 0325-7541.

This work on Listeria monocytogenes detection in different foods was carried out between January 2002 and July 2003. Ninety cold-served cooked meats, sliced and packaged by different methods and 132 pieces of soft cheeses were studied. These products were analyzed using the presence/ausence in 25 g criterion. L. monocytogenes was not found either in foods sliced over the counter or in controlled cheeses, but it was found in 10% of sliced cold-served foods and 5% of cut and cold-served meats vacuum packaged. These results led us to investigate the presence of these pathogen bacteria in different environmental samples. A hundred and fifteen points were swabbed including processing lines, raw materials, tools, and refrigerators. L. monocytogenes was found in 13.2% of the analyzed samples: 5% in packaging sector, 6.7% in meat processing lines and 1.5% in personalized sales. These results showed the presence of sites wherethe microorganismmay reside and create reservoirs, so that routinary measures of hygiene and disinfection were increased.

Keywords : Listeria monocytogenes; foods; environment.

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