Lee J A, Ghosh A C, Mann P G, Tee G H
J Hyg (Lond). 1972 Mar;70(1):141-50. doi: 10.1017/s002217240002218x.
Salmonella infection on two pig farms and its relation to infection in pigs at slaughter was studied. On the first farm feed ingredients were mixed on the farm, and these included fish meal which was found to be contaminated with salmonellas. The feed was pumped to pigs in liquid form. There was a high salmonella isolation rate at slaughter when the contaminated fish meal was fed in liquid feed, but it was significantly lower when no fish meal was fed to the pigs examined at slaughter. In some instances the same serotypes were found in fish meal and pig excreta on the farm and in caecal contents of the pigs at slaughter. No serotype was repeatedly isolated from any source and it appeared that the serotypes were not able to establish themselves in the pigs. It is concluded that infection found at slaughter originated on the farm where fish meal introduced and maintained infection. There was an opportunity for salmonellas to have multiplied in the liquid feed for several hours each day.On a second farm environmental conditions were similar, but feed was given in the form of ready-made pellets and nuts. Salmonellas were not isolated from the feed. At slaughter there was a significantly lower isolation rate than on the first farm.
对两个猪场的沙门氏菌感染及其与屠宰生猪感染的关系进行了研究。在第一个猪场，饲料原料在农场混合，其中包括被发现受沙门氏菌污染的鱼粉。饲料以液体形式泵入猪舍。当在液体饲料中投喂受污染的鱼粉时，屠宰时沙门氏菌分离率很高，但当不给屠宰时检测的猪投喂鱼粉时，分离率显著降低。在某些情况下，在农场的鱼粉和猪粪便以及屠宰时猪的盲肠内容物中发现了相同的血清型。没有从任何来源反复分离出任何血清型，而且似乎这些血清型无法在猪体内定殖。得出的结论是，屠宰时发现的感染源起于引入并维持感染的鱼粉所在的农场。沙门氏菌每天有机会在液体饲料中繁殖数小时。在第二个猪场，环境条件相似，但饲料是以现成的颗粒和坚果形式提供的。未从饲料中分离出沙门氏菌。屠宰时的分离率明显低于第一个猪场。
