Hacking W C, Mitchell W R, Carlson H C
Can J Comp Med. 1978 Oct;42(4):392-9.
Sources of Salmonellae infecting broiler chicken flocks in Ontario were investigated from July, 1975 to April, 1976. Three broiler flocks were investigated on each of four farms which received chicks from a common hatchery. Samples of feed and new litter were preenriched in nonselective broth subcultured to Salmonella-selective enrichment broth and plated on Salmonella-selective differential agar. Samples of used litter, water, culled chicks, insects, mice, wild birds and environmental swabs were not cultured initially in the nonselective broth. Fecal samples from principal and occasional flock attendants were examined for Samonellae. Salmonella infection, as judged by contaminated flock litter was detected in six flocks on two of the farms while the flocks on the other farms remained negative. Salmonellae were isolated from 23 of 412 feed samples (nine serotypes), six of 35 new wood shaving samples (four serotypes), one of 29 pools of culled chick viscera (one serotype) and 44 of 267 used litter samples (14 serotypes). These results indicate that broiler chicken flocks were infected with diverse Salmonellae introduced in day old chicks, pelleted feeds, wood shavings and residual contamination from the preceding flock.
1975年7月至1976年4月期间，对安大略省感染肉鸡群的沙门氏菌来源进行了调查。从一个共同孵化场接收雏鸡的四个农场中，每个农场调查了三个肉鸡群。饲料和新垫料样本先在非选择性肉汤中预富集，再转种到沙门氏菌选择性富集肉汤中，并接种在沙门氏菌选择性鉴别琼脂上。用过的垫料、水、淘汰雏鸡、昆虫、小鼠、野生鸟类和环境拭子样本最初不在非选择性肉汤中培养。对主要和偶尔进入鸡群的人员的粪便样本进行沙门氏菌检测。根据污染的鸡群垫料判断，在其中两个农场的六个鸡群中检测到沙门氏菌感染，而其他农场的鸡群仍为阴性。从412份饲料样本中的23份（9种血清型）、35份新木屑样本中的6份（4种血清型）、29份淘汰雏鸡内脏样本中的1份（1种血清型）和267份用过的垫料样本中的44份（14种血清型）中分离出沙门氏菌。这些结果表明，肉鸡群感染了多种沙门氏菌，这些沙门氏菌通过一日龄雏鸡、颗粒饲料、木屑以及前一批鸡群的残留污染引入。
