Mena, CristinaAlmeida, GonçaloCarneiro, LuísaTeixeira, PaulaHogg, TimGibbs, Paul A.2011-10-212011-10-212004MENA, Cristina [et al.] - Incidence of Listeria monocytogenes in different food products commercialized in Portugal. Food Microbiology. ISSN 0740-0020. 21:2 (2004) 213-216http://hdl.handle.net/10400.14/6709Several 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.engListeria monocytogenesIncidence in foodsjournal article