Central Veterinary Research Laboratory, Department of Agriculture, Fisheries, and Food, Celbridge, Co. Kildare, Ireland.
Foodborne Pathog Dis. 2009 Jan-Feb;6(1):111-20. doi: 10.1089/fpd.2008.0163.
In order to obtain an estimation of the prevalence of Salmonella spp. in flocks of broilers in the Republic of Ireland, a study was conducted in 2006 in a total of 362 broiler flocks associated with four integrated companies. Salmonella spp. was isolated from 27.3% of flocks, and eight Salmonella serovars were identified, none of which were Salmonella Enteritidis or Salmonella Typhimurium. The most prevalent serovar was Salmonella Mbandaka, followed by Salmonella Kentucky, which respectively accounted for 61.6% and 27.0% of positive samples. Notable differences were observed among the flocks associated with different integrated companies, both in the Salmonella spp. prevalence and in the serovar distribution. Results from routine official Salmonella testing in broiler production in 2006 showed similar serovar distribution within each integrated company from the associated hatchery and factory samples. In our study, differences in the prevalence of Salmonella at farm level did not correlate with differences in the percentages of positive chicken carcasses officially tested, which were low, for all the four companies investigated. Given the high prevalence of Salmonella Mbandaka, all human isolates obtained in the Republic of Ireland from 2003 to 2006 were compared to a subset of poultry isolates by pulsed-field gel electrophoresis, but an epidemiological link between the animal and the human strains could not be established. Finally the antimicrobial resistance analysis indicated a low proportion of resistant strains among the broiler flock isolates.
为了估计爱尔兰共和国肉鸡群中沙门氏菌的流行情况，2006 年对与四家综合企业有关的 362 个肉鸡群进行了一项研究。从 27.3%的鸡群中分离出沙门氏菌，鉴定出 8 种沙门氏菌血清型，均不是肠炎沙门氏菌或鼠伤寒沙门氏菌。最常见的血清型是 Mbandaka 沙门氏菌，其次是肯塔基沙门氏菌，分别占阳性样本的 61.6%和 27.0%。不同综合企业相关鸡群之间存在明显差异，无论是沙门氏菌的流行情况还是血清型分布情况均是如此。2006 年肉鸡生产中常规官方沙门氏菌检测结果表明，来自相关孵化场和工厂样本的每个综合企业内的血清型分布相似。在我们的研究中，农场水平沙门氏菌流行率的差异与官方检测阳性鸡只百分比的差异不相关，对所有四家调查公司而言，这一比例都很低。鉴于 Mbandaka 沙门氏菌的高流行率，对 2003 年至 2006 年期间在爱尔兰共和国获得的所有人类分离株与一组禽源分离株进行了脉冲场凝胶电泳比较，但未能确定动物和人类菌株之间的流行病学联系。最后，对禽源分离株的抗生素耐药性分析表明，耐药菌株比例较低。
