西藏拉萨市部分鸡场鸡沙门氏菌病流行病学调查

Epidemiological Investigation on Chicken Salmonellosis in Some Chicken Farms in Lhasa City of Tibet

为了解拉萨市鸡沙门氏菌病的流行情况,探讨主要发病原因,2015年4月至2016年9月,对拉萨市5个县(区)12个集约化养鸡场进行了流行病学调查。结果显示:所采集的1 203份样品中,共检测出沙门氏菌589株,阳性率达48.96%,说明拉萨市鸡沙门氏菌感染较为普遍;在所检测的样品中,种鸡、种蛋检出率分别为41.00%和37.00%,说明种鸡沙门氏菌带菌现象较为严重;病鸡样品检出率为70.54%,其中成年鸡为57.63%、鸡舍环境样本阳性率为16.67%,饲料阳性率为11.60%,说明这些都是造成沙门氏菌水平传播的主要风险因素。

In order to investigate the prevalence of Salmonella in Lhasa city and the main causes of Salmonellosis,epidemiological investigation was carried out in12chicken farms in5counties(districts)of Lhasa city,from April2015to September2016.The results showed as the follows:Among the1203collected samples,589strains ofSalmonella were isolated(positive rate of48.96%),which indicated the prevalence of Salmonella was high in Lhasacity.Among the tested samples,the positive rates of breeding chicken and hatching egg were41.00%and37.00%,respectively,which showed that the vertical transmission of Salmonella was seriously.Among the tested samples,thepositive rate of sick chicken was70.54%,of which the positive rate of adult chicken was57.63%,the positive rates ofenvironmental and feed samples were16.67%and11.60%,respectively.All mentioned above were the major factorsfor spreading of chicken Salmonella.