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首页> 外文期刊>Applied Microbiology >Longitudinal Molecular Epidemiological Study of Thermophilic Campylobacters on One Conventional Broiler Chicken Farm
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Longitudinal Molecular Epidemiological Study of Thermophilic Campylobacters on One Conventional Broiler Chicken Farm

机译：一家常规肉鸡场嗜热弯曲杆菌的纵向分子流行病学研究

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Improved understanding of the ecology and epidemiology of Campylobacter in the poultry farm environment is key to developing appropriate farm-based strategies for preventing flock colonization. The sources of Campylobacter causing broiler flock colonization were investigated on one poultry farm and its environment, from which samples were obtained on three occasions during each of 15 crop cycles. The farm was adjacent to a dairy farm, with which there was a shared concreted area and secondary entrance. There was considerable variation in the Campylobacter status of flocks at the various sampling times, at median ages of 20, 26, and 35 days, with 3 of the 15 flocks remaining negative at slaughter. Campylobacters were recoverable from various locations around the farm, even while the flock was Campylobacter negative, but the degree of environmental contamination increased substantially once the flock was positive. Molecular typing showed that strains from house surroundings and the dairy farm were similar to those subsequently detected in the flock and that several strains intermittently persisted through multiple crop cycles. The longitudinal nature of the study suggested that bovine fecal Campylobacter strains, initially recovered from the dairy yard, may subsequently colonize poultry. One such strain, despite being repeatedly recovered from the dairy areas, failed to colonize the concomitant flock during later crop cycles. The possibility of host adaptation of this strain was investigated with 16-day-old chickens experimentally exposed to this strain naturally present in, or spiked into, bovine feces. Although the birds became colonized by this infection model, the strain may preferentially infect cattle. The presence of Campylobacter genotypes in the external environment of the poultry farm, prior to their detection in broiler chickens, confirms the horizontal transmission of these bacteria into the flock and highlights the risk from multispecies farms.
机译：对家禽养殖场环境中弯曲杆菌的生态学和流行病学的深入了解是制定基于农场的适当策略以防止鸡群定居的关键。在一个家禽养殖场及其环境中调查了引起肉鸡群定殖的弯曲杆菌的来源，并在15个作物周期中的每3次中从中取样。该农场毗邻一个奶牛场，那里有一个共享的混凝土区域和次要入口。在不同采样时间，中位年龄为20、26和35天时，鸡群弯曲杆菌的状态存在很大差异，在15个鸡群中，有3个在屠宰后保持阴性。即使鸡群是弯曲杆菌阴性的，也可以从农场周围的各个地方回收弯曲杆菌，但是一旦鸡群呈阳性，环境污染的程度就会大大增加。分子分型显示，来自房屋周围环境和奶牛场的菌株与随后在羊群中检测到的菌株相似，并且几种菌株在多个作物周期中间歇地持续存在。研究的纵向性质表明，最初从奶牛场中回收的牛粪弯曲杆菌菌株可能随后在家禽中定殖。尽管从奶场中反复获得了这样的菌株，但在随后的农作周期中却未能在伴随的羊群中定殖。用实验暴露于天然存在于牛粪便中或掺入牛粪便中的16日龄鸡，对宿主适应此菌株的可能性进行了研究。尽管鸟类被这种感染模型定殖，但该菌株可能会优先感染牛。在肉鸡中检测到家禽养殖场之前，在其外部环境中存在弯曲杆菌基因型，这证实了这些细菌水平传播到羊群中，并突出了多物种养殖场的风险。

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