文章基本信息

标题：Case of contamination by Listeria monocytogenes in mozzarella cheese
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作者：Sara Greco ; Rita Tolli ; Teresa Bossù 等
期刊名称：Italian Journal of Food Safety
电子版ISSN：2239-7132
出版年度：2014
卷号：3
期号：1
DOI：10.4081/ijfs.2014.1708
语种：English
出版社：PAGEPress Publications
摘要：Following a Listeria monocytogenes detection in a mozzarella cheese sampled at a dairy plant in Lazio Region, further investigations have been conducted both by the competent Authority and the food business operatordairy factory (as a part of dairy factory HACCP control). In total, 90 dairy products, 7 brine and 64 environmental samples have been tested. The prevalence of Listeria monocytogenes was 24.4% in mozzarella cheese, and 9.4% in environmental samples, while brines were all negatives. Forty-seven strains of L. monocytogenes have been isolated, all belonging to 4b/4e serotype. In 12 of these, the macrorestriction profile has been determined by means of pulsed field gel electrophoresis. The profiles obtained with AscI enzyme showed a 100% similarity while those obtained with ApaI a 96.78% similarity. These characteristics of the isolated strains jointly with the production process of mozzarella cheese has allowed to hypothesise an environmental contamination.
关键词：Listeria monocytogenes; Mozzarella; PFGE; Serotypes