Widespread Listeriosis Outbreak Attributable to Pasteurized Cheese, Which Led to Extensive Cross-Contamination Affecting Cheese Retailers, Quebec, Canada, 2008
Widespread Listeriosis Outbreak Attributable to Pasteurized Cheese, Which Led to Extensive Cross-Contamination Affecting Cheese Retailers, Quebec, Canada, 2008
复制标题
DOI：
10.4315/0362-028x.jfp-11-236
复制
发表时间：
2012-01-01
影响因子：
2
通讯作者：
Bekal, Sadjia
中科院分区：
文献类型：
--
作者：
Gaulin, Colette;Ramsay, Danielle;Bekal, Sadjia
2008年在加拿大魁北克省发生了一次单核细胞增多性李斯特菌大爆发，涉及一株单核细胞增多性李斯特菌(Lm P93)，其特征是脉冲场凝胶电泳(PFGE)，并与巴氏杀菌牛奶干酪的消费有关。本报告描述了随后的调查结果。用标准化问卷对全省所有感染LMP93的人进行了访谈。由魁北克省L农业部食品检验处对暴发的零售商和奶酪厂进行了微生物和环境调查。2008年6月8日至12月31日，向公共卫生当局报告了38例LMP93确诊病例，包括16例产妇-新生儿病例(14名孕妇和2名无症状母亲所生婴儿)。从零售商收集的许多品牌奶酪的Lm P93检测呈阳性的追溯发现，9月3日和4日有两家奶酪厂受到单核细胞增多性李斯特菌菌株的污染。9月8日提供了两家工厂的PFGE档案，并确认有一家工厂与此次暴发有关。这两家工厂的产品被分销给该省300多家零售商，导致零售库存广泛交叉污染。单核细胞增多性乳杆菌无处不在，通常在奶酪生产之前的热处理后会出现污染。受污染的软质地奶酪特别容易滋生细菌。需要不断进行监管和行业努力，以减少食品中李斯特菌的存在，包括巴氏杀菌产品。零售商应该被告知交叉污染的风险，即使是软的巴氏杀菌奶酪也是如此，并应用避免的方法。
A major Listeria monocytagenes outbreak occurred in the province of Quebec, Canada, in 2008, involving a strain of L. monocytogenes (LM P93) characterized by pulsed-field gel electrophoresis (PFGE) and associated with the consumption of pasteurized milk cheese. This report describes the results of the ensuing investigation. All individuals affected with LM P93 across the province were interviewed with a standardized questionnaire. Microbiological and environmental investigations were conducted by the Quebec's Food Inspection Branch of Ministere de l'Agriculture, des Pecheries et de l'Alimentation du Quebec among retailers and cheese plants involved in the outbreak. Between 8 June and 31 December 2008, 38 confirmed cases of LM P93 were reported to public health authorities, including 16 maternal-neonatal cases (14 pregnant women, and two babies born to asymptomatic mothers). The traceback of many brands of cheese that tested positive for LM P93 collected from retailers identified two cheese plants contaminated by L. monocytogenes strains on 3 and 4 September. PFGE profiles became available for both plants on 8 September, and confirmed that a single plant was associated with the outbreak. Products from these two plants were distributed to more than 300 retailers in the province, leading to extensive cross-contamination of retail stock. L. monocytogenes is ubiquitous, and contamination can occur subsequent to heat treatment, which usually precedes cheese production. Contaminated soft-textured cheese is particularly prone to bacterial growth. Ongoing regulatory and industry efforts are needed to decrease the presence of Listeria in foods, including pasteurized products. Retailers should be instructed about the risk of cross-contamination, even with soft pasteurized cheese and apply methods to avoid it.