Carrique-Mas J J, Breslin M, Snow L, Arnold M E, Wales A, McLaren I, Davies R H
Department of Food and Environmental Safety, Veterinary Laboratories Agency, Addlestone, Surrey, UK.
Epidemiol Infect. 2008 Nov;136(11):1537-46. doi: 10.1017/S095026880700012X. Epub 2008 Jan 4.
A follow-on study was carried out on 23 holdings identified as Salmonella positive in the 2004/2005 European Union (EU) baseline survey of Salmonella in laying hens. Eleven of 13 cage and 4/7 floor houses remained positive for Salmonella when the new flock was tested, and from 10/13 cage and 3/7 floor houses a Salmonella of the same serovar/phage type as found in the EU survey was isolated. There was a high correlation between the level of contamination in the houses at the time of the EU survey and in the follow-on flock. On seven occasions the house identified as positive in the EU survey was sampled after cleaning and disinfection but before a new flock was placed, and in all of them Salmonella could be isolated from the houses. The observed number of infected houses in infected holdings suggests that the holding-level prevalence in the United Kingdom would be about 21% higher than the results obtained in the EU survey.
对在2004/2005年欧盟蛋鸡沙门氏菌基线调查中被确定为沙门氏菌阳性的23个养殖场进行了跟踪研究。当新鸡群接受检测时，13个笼养场中的11个以及7个平养场中的4个沙门氏菌检测仍为阳性，并且从13个笼养场中的10个以及7个平养场中的3个分离出了与欧盟调查中发现的相同血清型/噬菌体类型的沙门氏菌。欧盟调查时鸡舍的污染水平与跟踪鸡群中的污染水平之间存在高度相关性。有7次，在欧盟调查中被确定为阳性的鸡舍在清洁和消毒后但在放入新鸡群之前进行了采样，并且在所有这些鸡舍中都能分离出沙门氏菌。受感染养殖场中观察到的受感染鸡舍数量表明，英国养殖场层面的流行率比欧盟调查结果高出约21%。
