PDF(Pubmed)
Abstract：
A longitudinal study was conducted to determine the dominance and prevalence of Salmonella enterica subsp in Australian broiler breeder flocks and hatcheries. Twenty-two flocks (n = 3339 samples) were sampled over 6 time points beginning at placement until week 40. Hatcheries (n = 274 samples) were sampled following removal of chicks hatched from eggs originating from the 22 donor parent flocks. The percent of positive flocks (36%) and frequency of positive samples (15.6%) were highest during rearing at week 7. The frequency of positive samples decreased over the 40 weeks; however, the number of positive flocks remained relatively consistent. Geographical location had a greater influence on Salmonella detection frequency than company sample origin, despite differing management and vaccination protocols within and between companies. Twelve serovars were detected in total. The predominant serovars during rearing were Salmonella Mbandaka (32%), S. Saintpaul (27%), and S. Liverpool (18%). The predominant serovars detected during production were S. Cubana (27%), S. Saintpaul (24%), and S. Havana (13%). Salmonella Typhimurium, S. Ohio, and S. Hessarek were detected in the hatcheries. Of the serovars detected, only S. Typhimurium and S. Ohio were found in both broiler breeder flocks and hatcheries. However, detection did not correspond to the status of the flock eggs feeding into the hatchery. This study provides an up-to-date capture of the current Salmonella serovars circulating in the broiler breeder industry. Continued surveillance within the Australian Chicken Meat industry is imperative to mitigate and reduce the risk of salmonellosis in the community related to chicken meat. IMPORTANCE This study identified prevalent and dominant Salmonella enterica subsp in Australian Broiler Breeder flocks, as well as in hatcheries post chick hatch and removal, from eggs originating from these donor parent flocks. The captured Salmonella data was further compared to the most common Salmonella serovars isolated from broilers, as well as human salmonellosis notification data, which is useful for consideration of the circulating serovars within the chicken meat industry and their significance in public health. As there are multiple entry points for Salmonella during the entire chicken meat production chain that can lead to carcass contamination, it is important to distinguish serovars present between the different stages of vertical integration to implement and enable Salmonella control strategies.
摘要：
进行了一项纵向研究，以确定澳大利亚肉鸡饲养场和孵化场中肠沙门氏菌亚种的优势和患病率。从放置开始直到第40周,在6个时间点对22个群(n=3339个样品)进行采样。从来自22个供体亲代鸡群的卵中取出孵化的小鸡后，对孵化场（n=274个样品）进行了采样。在第7周饲养期间，阳性羊群的百分比（36％）和阳性样本的频率（15.6％）最高。阳性样本的频率在40周内下降；然而，阳性羊群的数量保持相对一致。地理位置对沙门氏菌检测频率的影响大于公司样本来源，尽管公司内部和公司之间的管理和疫苗接种协议不同。总共检测到12个血清型。饲养过程中主要的血清型是沙门氏菌Mbandaka（32％），S、圣保罗（27%），和S.利物浦（18%）。在生产过程中检测到的主要血清变型是S.Cubana（27％），S、圣保罗（24%），和哈瓦那（13%）。鼠伤寒沙门氏菌,美国俄亥俄州，和S.Hessarek在孵化场被发现。在检测到的血清变型中，仅在肉鸡饲养场和孵化场中发现了鼠伤寒沙门氏菌和俄亥俄州沙门氏菌。然而,检测结果与饲喂孵化场的鸟卵状况不符。这项研究提供了在肉鸡饲养业中流通的当前沙门氏菌血清变型的最新捕获。澳大利亚鸡肉行业的持续监测对于减轻和降低与鸡肉相关的社区沙门氏菌病的风险至关重要。重要性这项研究确定了澳大利亚肉鸡饲养员群中流行和显性的肠沙门氏菌亚种，以及在孵化场后的小鸡孵化和移除，来自这些供体亲群的卵子。将捕获的沙门氏菌数据与从肉鸡中分离出的最常见的沙门氏菌血清型进行了进一步比较，以及人类沙门氏菌病通知数据，这对于考虑鸡肉行业中的循环血清型及其在公共卫生中的重要性很有用。由于沙门氏菌在整个鸡肉生产链中有多个切入点，可能导致car体污染，重要的是要区分纵向整合的不同阶段之间存在的血清型，以实施和启用沙门氏菌控制策略。
