Overesch Gudrun, Haas Katrin, Kuhnert Peter
Institute of Veterinary Bacteriology, University of Bern, 3012 Bern, Switzerland.
Pathogens. 2020 Sep 10;9(9):742. doi: 10.3390/pathogens9090742.
Human campylobacteriosis is the most prevalent zoonosis, with chicken meat contributing substantially to the number of cases. Measures to avoid or at least reduce exposure by meat contaminated with (.) spp. are needed. With regard to the process hygiene criterion introduced in 2018 for spp. on broiler carcasses, we evaluated the performance of a recently developed quantitative real-time PCR (qPCR) for on random caecal samples and chicken meat. With the qPCR on pooled caecal samples not only positive (69.6%) versus negative broiler herds (30.4%) were identified, but herds highly colonized with (39.4%) could also be identified. From the chicken meat samples, 8.0% were positive for by qPCR and 0.7% by enumeration (>10 cfu/g) compared to 58.3% using cultural enrichment. Given the higher sensitivity, the qPCR method could replace the currently used enumeration method to assess the process hygiene criterion for spp. on broiler carcasses. Moreover, with the qPCR, a reliable identification of colonized incoming broiler herds a few days before slaughter is feasible, which provides important information to optimize slaughter processes. Finally, identifying and monitoring herds with high colonization rates could help to individually improve biosecurity measures at farm level, eventually reducing the load on chicken meat.
人弯曲杆菌病是最常见的人畜共患病,鸡肉导致了大量病例。需要采取措施避免或至少减少接触受弯曲杆菌属污染的肉类。关于2018年引入的肉鸡胴体弯曲杆菌属的加工卫生标准,我们评估了一种最近开发的针对盲肠随机样本和鸡肉中弯曲杆菌属的定量实时聚合酶链反应(qPCR)的性能。通过对合并盲肠样本进行qPCR,不仅可以识别弯曲杆菌属阳性(69.6%)与阴性肉鸡群(30.4%),还可以识别高度定殖弯曲杆菌属的鸡群(39.4%)。在鸡肉样本中,通过qPCR检测,弯曲杆菌属阳性率为8.0%,通过计数(>10 cfu/g)检测为0.7%,而采用培养富集法检测为58.3%。鉴于qPCR具有更高的灵敏度,可以取代目前用于评估肉鸡胴体弯曲杆菌属加工卫生标准的计数方法。此外,通过qPCR,在屠宰前几天对定殖弯曲杆菌属的 incoming肉鸡群进行可靠识别是可行的,这为优化屠宰过程提供了重要信息。最后,识别和监测弯曲杆菌属定殖率高的鸡群有助于在农场层面单独改进生物安全措施,并最终降低鸡肉中的弯曲杆菌属负荷量