PDF(Pubmed)
Abstract：
Considering Salmonella transmission occurs through several routes in integrated broiler operations, control of nontyphoidal Salmonella in commercial farms is essential. This study aimed to compare the distribution of persistent Salmonella serovars in environments and dead chickens between 5 major integrated broiler operations in Korea. The prevalence of Salmonella-positive farms in dust prior to placement by operations was 0 to 25%, but the prevalence in dust and feces at the time of depletion was increased to 16.7 to 41.7% and 16.7 to 66.7%, respectively. Moreover, the prevalence of farms with Salmonella in chickens that died within 1 week old and at 4 to 5 weeks old ranged from 8.3 to 58.3% and 16.7 to 41.7%, respectively. The prevalence of Salmonella enterica serovar Infantis-positive farms in dust prior to placement and in chickens that died within 1 week old was 5.2 and 3.4%, respectively, but the prevalence in dust and feces at the time of depletion and in chickens that died at 4 to 5 weeks old was significantly increased to 27.6, 41.4, and 20.7%, respectively (P < 0.05). Interestingly, the plasmid of emerging S. Infantis (pESI) was only identified in S. Infantis, and the prevalence of multidrug-resistance was significantly higher in pESI-positive S. Infantis (99.2%) than in pESI-negative S. Infantis (6.7%) (P < 0.05). The distribution of pulsotypes between pESI-positive and pESI-negative S. Infantis were varied, but a majority of S. Infantis were clustered only 2 pulsotypes. Moreover, pESI-positive S. Infantis harbored more virulence factors than pESI-negative S. Infantis. This study is the first report on characteristics of S. Infantis carrying the pESI plasmid in commercial broiler farms in Korea.
摘要：
考虑到沙门氏菌在综合肉鸡经营中通过几种途径传播，在商业农场中控制非伤寒沙门氏菌至关重要。这项研究旨在比较韩国5种主要综合肉鸡作业之间环境和死鸡中持久性沙门氏菌血清变型的分布。在通过手术安置之前，沙门菌阳性农场在粉尘中的患病率为0％至25％，但是消耗时灰尘和粪便的患病率增加到16.7至41.7％和16.7至66.7％，分别。此外，在1周龄和4至5周龄死亡的鸡场中沙门氏菌的患病率为8.3至58.3％和16.7至41.7％，分别。在放置前的粉尘和在1周龄内死亡的鸡中，肠道沙门氏菌阳性的婴儿农场的患病率为5.2％和3.4％，分别,但是耗竭时的灰尘和粪便以及4至5周龄死亡的鸡的患病率显着增加到27.6、41.4和20.7％，分别为(P<0.05)。有趣的是,新生S.Infantis（pESI）的质粒仅在S.Infantis中鉴定，pESI阳性婴儿链球菌的多药耐药率（99.2%）明显高于pESI阴性婴儿链球菌（6.7%）（P<0.05）。pESI阳性和pESI阴性S之间的脉型分布不同。但大多数婴儿链球菌仅聚集2个脉冲型。此外，pESI阳性婴儿链球菌比pESI阴性婴儿链球菌具有更多的毒力因子。这项研究是关于韩国商业肉鸡养殖场中携带pESI质粒的婴儿链球菌特性的首次报道。
