Hudson J A, Avery S M
Meat Industry Research Institute of New Zealand (Inc.), P.O. Box 617, Hamilton, New Zealand.
N Z Vet J. 1993 Jun;41(2):78-81. doi: 10.1080/00480169.1993.35739.
Environmental samples and samples of partially processed fish from a cold-smoked salmon processing and packing plant, and product samples purchased from retail outlets, were examined for the presence of Listeria monocytogenes and other Listeria spp., motile aeromonads and Yersinia enterocolitica. Listeria spp. were not isolated from raw fish but were a contaminant of processed and partially processed fish. Listeria spp. were also detected in 18.8% of surfaces in contact with fish. Unlike Listeria spp., motile aeromonads were isolated from the raw fish but not from the finished product. They were more frequently isolated from environmental sources than Listeria spp. Yersinia enterocolitica was not isolated from any of the samples tested. Little evidence was found to show a coincidence of motile aeromonads and Listeria spp., since only one subset of samples showed such a link. It is concluded that contamination by Listeria spp. was from environmental sources at the processing plant at, or beyond, the slicing stage. Reducing the number of wet areas and special cleaning and sanitation considerations for a contaminated site (the freezer seal) are suggested as ways of reducing contamination of the product.
对一家冷熏三文鱼加工包装厂的环境样本、部分加工的鱼类样本以及从零售商店购买的产品样本进行了检测，以确定是否存在单核细胞增生李斯特菌和其他李斯特菌属、运动性气单胞菌和小肠结肠炎耶尔森菌。在生鱼中未分离出李斯特菌属，但在加工和部分加工的鱼类中存在该菌污染。在18.8%与鱼接触的表面也检测到了李斯特菌属。与李斯特菌属不同，运动性气单胞菌是从生鱼中分离出来的，而成品中未分离到。与李斯特菌属相比，它们更常从环境来源中分离出来。在所检测的任何样本中均未分离出小肠结肠炎耶尔森菌。几乎没有证据表明运动性气单胞菌和李斯特菌属存在巧合，因为只有一组样本显示出这种关联。得出的结论是，李斯特菌属的污染来自加工厂切片阶段及以后的环境来源。建议减少潮湿区域的数量，并对受污染部位（冷冻机密封处）进行特殊清洁和卫生处理，以此作为减少产品污染的方法。
