永宁县永通公司机砖厂承包的奶牛场,在92年6月2日晚有一只奶牛突然死亡,当日下午用牛肉拌黄瓜供职工就餐。食入后约一小时出现恶心、呕吐、腹泻等症状。据查就餐人数150人,吃牛肉拌黄瓜等有135人,出现症状有82人,发病率为60.7％;就诊人数52人,住院治疗有30人。据调查死牛腿部 Yongning County, Yong Tong brick factory contracted plant, in the evening of June 2, 1992, a cow suddenly died in the afternoon with beef for cucumber workers for dinner. About one hour after ingestion nausea, vomiting, diarrhea and other symptoms. It is found that the number of meals 150 people, eat beef with cucumber and other 135 people, there are 82 people with symptoms, the incidence rate of 60.7%; Visits 52, hospitalization 30. According to the investigation dead cow’s leg