Riemann H, Himathongkham S, Willoughby D, Tarbell R, Breitmeyer R
Department of Population Health and Reproduction, School of Veterinary Medicine, University of California at Davis 95616, USA.
Avian Dis. 1998 Jan-Mar;42(1):67-71.
A cross-sectional study was conducted between August 1995 and November 1996. Sixty California egg-producing ranches were chosen at random; 39 ranches agreed to participate in the study. The surface of the manure pile in one house on each ranch was sampled by drag swabbing. The drag swabs were tested for Salmonella using a most probable number procedure that had a detection level of one to five Salmonella per drag swab. In 12 ranches (32.4%), the drag swabs were negative for Salmonella; the remaining had Salmonella counts in the range of 1 to over 1700 per swab. Twenty-two different serotypes were found. Salmonella heidelberg and Salmonella cerro represented the majority of the typed isolates. Salmonella enteritidis (SE) was found on only one ranch. This study found SE to be rare in California egg ranches, which implies that these ranches are not a major source of S. enteritidis.
1995年8月至1996年11月进行了一项横断面研究。随机选择了60个加利福尼亚州的产蛋牧场；39个牧场同意参与该研究。每个牧场一间鸡舍内粪堆表面通过拖拭采样。使用最大可能数法对拖拭样本进行沙门氏菌检测，检测水平为每个拖拭样本含1至5个沙门氏菌。在12个牧场（32.4%）中，拖拭样本沙门氏菌检测呈阴性；其余牧场每个样本的沙门氏菌计数范围为1至超过1700个。发现了22种不同的血清型。海德堡沙门氏菌和塞罗沙门氏菌是大多数分型分离株。肠炎沙门氏菌（SE）仅在一个牧场被发现。本研究发现SE在加利福尼亚州的蛋鸡牧场中很罕见，这意味着这些牧场不是肠炎沙门氏菌的主要来源。
