Department of Life Sciences, The University of the West Indies, St Augustine, Trinidad and Tobago, WI.
Epidemiol Infect. 2011 May;139(5):718-27. doi: 10.1017/S095026881000172X. Epub 2010 Jul 22.
Contamination of locally produced, ready-to-eat meats by Listeria spp. has been previously reported at one processing plant in Trinidad. However, the status of this pathogen in locally produced products sold at retail outlets is unknown. This study was conducted to establish whether there is a risk to consumers of locally processed meats caused by the presence of Listeria spp., and whether a link exists between the presence of the pathogen in retail products and the manufacturing plant of one brand (B). Four hundred and eighty ready-to-eat meat products of two popular local brands (A and B) were collected from retail outlets and analysed for the presence of Listeria spp. together with food samples and surfaces from one manufacturing plant (B). Eighty-eight of the retail products (18·3%) were contaminated with Listeria spp., of which, 52·3% were L. innocua, 44·3% were L. monocytogenes and 3·4% belonged to the L. seeligeri-L. welshimeri-L. ivanovii (Siwi) group. L. innocua was found in 15 in-process food samples and on three surfaces of equipment at plant B. Four in-process food samples were also contaminated with Siwi isolates. Repetitive extragenic palindromic PCR DNA fingerprinting showed a possible association between strains of different Listeria spp. and brand as well as with manufacturing plant B.
先前曾有报道称，特立尼达的一家加工厂生产的即食本地肉类受到李斯特菌污染。然而，目前尚不清楚零售商店销售的本地生产产品中这种病原体的状况。本研究旨在确定消费者是否因本地加工肉类中存在李斯特菌而面临风险，以及零售产品中病原体的存在是否与一个品牌（B）的制造工厂之间存在关联。从零售店收集了两种流行的本地品牌（A 和 B）的 480 种即食肉类产品，并分析了它们是否存在李斯特菌。同时还分析了一家制造工厂（B）的食品样本和表面样本。88 种零售产品（18.3%）受到李斯特菌污染，其中 52.3%为无害李斯特菌，44.3%为单核细胞增生李斯特菌，3.4%属于李斯特菌-威尔斯李斯特菌-伊利诺伊李斯特菌（Siwi）组。在 B 厂的 15 种加工食品样本和三个设备表面发现了无害李斯特菌。四种加工食品样本也受到 Siwi 分离株的污染。重复基因外回文 PCR DNA 指纹图谱显示，不同李斯特菌菌株与品牌以及与 B 厂之间可能存在关联。
