Department of Bacteriology and Food Safety, Animal Health and Veterinary Laboratories Agency, Woodham Lane, New Haw, Addlestone, Surrey KT15 3NB, UK.
Vet Microbiol. 2013 Oct 25;166(3-4):543-9. doi: 10.1016/j.vetmic.2013.07.003. Epub 2013 Jul 12.
Cereal ingredients for animal feedstuffs may become contaminated by Salmonella on their farms of origin. This is often concentrated in multiple foci, owing to contamination by rodents and other wildlife which may be missed by routine sampling, and may involve serovars of particular public health significance, such as Salmonella Typhimurium (STM). The study examined such contamination in domestically-produced cereal ingredients in the United Kingdom. Cereal-producing farms with associated cattle or pig enterprises (43) and feedmills (6) were investigated, following the isolation of STM from their premises (feedmills) or STM DT104 from their livestock (farms) by routine surveillance. Cereal samples from feedmills yielded two STM isolates from the same premises, of the same phage types as were isolated from wild bird faeces at ingredient intake and product loading areas. Farm investigations identified numerous Salmonella serovars, including STM, on grain harvesting and handling equipment, in grain storage areas, and in wildlife samples. Mice were removed from one pig farm and shed Salmonella Derby and Salmonella Bovismorbificans for 10 months afterwards. Grain stores more than one kilometre away from livestock areas were rarely found to be contaminated with STM. The principal issues with Salmonella contamination of cereals appeared to be the use of livestock areas as temporary grain stores on cattle farms, and access to stored grain by wildlife and domestic animals.
动物饲料的谷物原料在其产地农场可能受到沙门氏菌的污染。这通常集中在多个焦点，由于啮齿动物和其他野生动物的污染可能会被常规采样所忽略，并且可能涉及具有特殊公共卫生意义的血清型，如鼠伤寒沙门氏菌（STM）。本研究调查了英国国内生产的谷物原料中的这种污染情况。在常规监测从其场所（饲料厂）分离出 STM 或从其牲畜（农场）分离出 STM DT104 后，对具有相关牛或猪企业的谷物生产农场（43 个）和饲料厂（6 个）进行了调查。从饲料厂采集的谷物样本从同一地点分离出了两个 STM 分离株，其噬菌体型与在原料摄入和产品装载区从野生鸟类粪便中分离出的相同。农场调查发现了许多沙门氏菌血清型，包括 STM，在谷物收获和处理设备、谷物储存区以及野生动物样本中。从一个养猪场清除了老鼠，并在随后的 10 个月中发现了猪源德比沙门氏菌和牛源鲍氏沙门氏菌的脱落。距离牲畜区一公里以上的谷物储存区很少发现 STM 污染。谷物中沙门氏菌污染的主要问题似乎是将牲畜区用作牛场的临时谷物储存区，以及野生动物和家畜进入储存谷物的机会。
