Incidence of Listeria monocytogenes in different food products commercialized in Portugal |
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| Affiliation: | 1. Escola Superior de Biotecnologia, R. Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal;2. Leatherhead Food International, Surrey, UK;1. National Institute of Public Health - National Institute of Hygiene, Department of Food Safety, 24 Chocimska str, 00-791 Warszawa, Poland;2. University of Warsaw, Faculty of Biology, Department of Applied Microbiology, 1 Miecznikowa str, 02-096 Warsaw, Poland;1. College of Nutrition, Federal University of Mato Grosso, 78060-900, Cuiaba, MT, Brazil;2. Laboratory of Bacterial Zoonoses, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, 21040-360, Rio de Janeiro, RJ, Brazil;1. Institute of Milk Hygiene, Milk Technology and Food Safety, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine, Veterinaerplatz 1, 1210 Vienna, Austria;2. Institute of Immunology, Department of Pathobiology, University of Veterinary Medicine, Veterinaerplatz 1, 1210 Vienna, Austria;3. Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, United Kingdom;1. Brigham & Women’s Hospital, Division of Infectious Diseases, Boston, MA, USA;2. International Society for Infectious Diseases, Boston, MA, USA;3. Tufts University, Boston, MA, USA;4. University of Massachusetts, Division of Infectious Diseases, Worcester, MA, USA;1. Institute of Milk Hygiene, Milk Technology, and Food Science, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine, Veterinärplatz 1, A-1210 Vienna, Austria;2. Department of Nutritional Sciences, Faculty of Life Sciences, University of Vienna, Althanstraße 14, 1090 Vienna, Austria;3. Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland;4. Faculty of Food Science and Engineering, Dunarea de Jos University of Galati, str. Domnesca 47, 800008, Galati, Romania;5. University of Burgos, Department of Biotechnology and Food Science, Hospital del Rey, s/n, 09001 Burgos, Spain;6. Agricultural University of Athens, Iera odos 75, 118 55, Athens Greece;7. VUP Food Research Institute, National Agricultural and Food Centre, Priemyselná 4, SK 824 75 Bratislava, Slovak Republic |
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| Abstract: | Several types of food products on sale in Portugal, were examined for the presence of Listeria monocytogenes. Secondary enrichments, in Fraser broth, were analysed by the mini-Vidas LMO, enzyme-linked fluorescent immunoassay technique. Positive samples were confirmed by isolation on Oxford and PALCAM selective agars followed by biochemical characterization. Of 1035 samples, 72 (7.0%) were positive for L. monocytogenes, the majority being from raw products (milk, meat, fish, flour) although some heat-processed or fermented foods (ready-to-eat) were also positive. In Portugal, a predilection for fresh cheese was indicated as a potential risk for consumers. |
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