1996年9月2日,牡丹江市新荣街铁路住宅居民于××,毕××祖孙二人因食用火腿肠引起食物中毒。1 流行病学调查 1995年9月1日,毕××的姑姑从附近食品经销站购得4根××牌火腿肠(90g/根)。次日凌晨6:00左右,毕××取出其中一根吃掉1/3左右,觉得不好吃,其祖母于××又吃了不到1/3,二人共食约2/3根。7:00左右皆出现中毒症状。据调查,于××、毕 On September 2, 1996, residents of Xinrong Street Railway in Mudanjiang City were involved in food poisoning due to the consumption of sausage due to the consumption of ham sausage. 1 epidemiological survey September 1, 1995, Bi × × aunt from the nearby food distribution station bought four × × licensing ham sausage (90g / root). Around 6:00 the next day, Bi × × removed one of them eaten about 1/3, I feel bad, his grandmother in the × × ate less than 1/3, the total food about 2/3 . About 7:00 poisoning symptoms appear. According to the survey, in × ×, Bi