Althaus Denise, Jermini Marco, Giannini Petra, Martinetti Gladys, Reinholz Danuta, Nüesch-Inderbinen Magdalena, Lehner Angelika, Stephan Roger
1 Institute for Food Safety and Hygiene, National Centre for Enteropathogenic Bacteria and Listeria, Vetsuisse Faculty University of Zurich, Zurich, Switzerland .
2 Cantonal Laboratory Ticino , Division of Public Health, Department of Health, Bellinzona, Switzerland .
Foodborne Pathog Dis. 2017 Apr;14(4):219-222. doi: 10.1089/fpd.2016.2232. Epub 2017 Feb 16.
In January and February 2016, five cases of confirmed and two cases of probable infection due to Listeria monocytogenes serotype 4b, sequence type (ST) 6 belonging to a single pulsed-field gel electrophoresis pulsotype pattern were registered in a region of southern Switzerland. L. monocytogenes was detected in blood samples (four cases) and pleural fluid (one case). Furthermore, L. monocytogenes 4b ST6 was detected in a stool sample of an asymptomatic person exposed to a common food. Forthwith, the food safety authority and a local gourmet meat producer reported L. monocytogenes contamination of meat pâté. Analysis of further food and environmental samples from the premises of the producer yielded isolates matching the clinical strains and confirmed the presence of L. monocytogenes 4b ST6 in the mincing machine as the cause of the food contamination.
2016年1月和2月，瑞士南部某地区记录了5例确诊感染和2例可能感染单核细胞增生李斯特菌血清型4b、序列类型（ST）6的病例，这些病例属于单一脉冲场凝胶电泳脉冲型模式。在血液样本（4例）和胸腔积液（1例）中检测到了单核细胞增生李斯特菌。此外，在一名接触过一种常见食物的无症状者的粪便样本中检测到了单核细胞增生李斯特菌4b ST6。随即，食品安全当局和当地一家美食肉类生产商报告了肉酱被单核细胞增生李斯特菌污染的情况。对该生产商场所的更多食品和环境样本进行分析后，分离出了与临床菌株匹配的菌株，并确认切碎机中存在单核细胞增生李斯特菌4b ST6是食品污染的原因。
