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Microbiology"],"published-print":{"date-parts":[[2013]]},"abstract":"<jats:p><jats:italic>Objective<\/jats:italic>. A total of 725<jats:italic>Listeria monocytogenes<\/jats:italic>isolates, 607 from various foods and 118 from clinical cases of listeriosis, were investigated concerning their ability to form biofilms, at 4\u00b0C during 5 days and at 37\u00b0C during 24\u2009h.<jats:italic>Methods<\/jats:italic>. Biofilm production was carried out on polystyrene tissue culture plates. Five<jats:italic>L. monocytogenes<\/jats:italic>isolates were tested for biofilm formation after being exposed to acidic and osmotic stress conditions.<jats:italic>Results<\/jats:italic>. Significant differences (<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M1\"><mml:mi>P<\/mml:mi><mml:mo>&lt;<\/mml:mo><mml:mn>0.01<\/mml:mn><\/mml:math>) between clinical and food isolates were observed. At 37\u00b0C for 24\u2009h, most food isolates were classified as weak or moderate biofilm formers whereas all the clinical isolates were biofilm producers, although the majority were weak. At 4\u00b0C during 5 days, 65 and 59% isolates, from food and clinical cases, respectively, were classified as weak. After both sublethal stresses, at 37\u00b0C just one of the five isolates tested was shown to be more sensitive to subsequent acidic exposure. However, at 4\u00b0C both stresses did not confer either sensitivity or resistance.<jats:italic>Conclusions<\/jats:italic>. Significant differences between isolates origin, temperature, and sublethal acidic stress were observed concerning the ability to form biofilms. Strain, origin, and environmental conditions can determine the level of biofilm production by<jats:italic>L. monocytogenes<\/jats:italic>isolates.<\/jats:p>","DOI":"10.1155\/2013\/524975","type":"journal-article","created":{"date-parts":[[2013,12,29]],"date-time":"2013-12-29T16:36:30Z","timestamp":1388334990000},"page":"1-6","source":"Crossref","is-referenced-by-count":31,"title":["Biofilm Formation among Clinical and Food Isolates of<i>Listeria monocytogenes<\/i>"],"prefix":"10.1155","volume":"2013","author":[{"given":"Joana","family":"Barbosa","sequence":"first","affiliation":[{"name":"Centro de Biotecnologia e Qu\u00edmica Fina (CBQF), Laborat\u00f3rio Associado, Escola Superior de Biotecnologia, Universidade Cat\u00f3lica Portuguesa\/Porto, Rua Dr. Ant\u00f3nio Bernardino Almeida, 4200-072 Porto, Portugal"}]},{"given":"Sandra","family":"Borges","sequence":"additional","affiliation":[{"name":"Centro de Biotecnologia e Qu\u00edmica Fina (CBQF), Laborat\u00f3rio Associado, Escola 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