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Presence of Listeria monocytogenes in ready-to-eat foods available in open markets, delicatessens and supermarkets, Bogotá, 2002-2008 Presencia de Listeria monocytogenes en alimentos listos para el consumo, procedentes de plazas de mercado y delicatessen de supermercados de cadena, Bogotá, D.C, 2002-2008

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Author(s): Ana Isabel Muñoz | Mercedes Vargas | Ligia Otero | Graciela Díaz | Viviana Guzmán

Journal: Biomédica
ISSN 0120-4157

Volume: 31;
Issue: 3;
Start page: 428;
Date: 2011;
Original page

Keywords: Listeria monocytogenes | enfermedades transmitidas por alimentos | listeriosis | salud pública

ABSTRACT
Introduction. The increase in diseases transmitted by foods has become a public health problem. Listeria monocytogenes, the etiological agent of listeriosis or typical food poisoning, is considered to be among the most important food borne illnesses. High risk foods for L.monocytogenes have been recognized as foods already prepared for consumption and made available in retail outlets.Objective. The presence of L. monocytogenes was identified in prepared foods found in open markets and delicatessens in the city of Bogotá.Material and methods. A transverse descriptive study over a 7-year period, with an analytic component, in which 600 foods were analyzed--300 from delicatessens and 300 from open market places. Reference methods were used to determine the presence or absence of L. monocytogenes in 25 grams or milliliters a food sample.Results. Of the 600 samples, 68 were positive for L. monocytogenes (11.3%). Twenty-six (38.2%) were taken from delicatessens and 42 (61.8%) from open market places. The serotype most frequently isolated was 4b, with 53 (78.0%) isolations. Fresh cheeses and matured cheeses showed greater contamination with L. monocytogenes than the other foods (p
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