自新中国成立以来 ,各种传染病的发病率 ,尤其是烈性传染病得到了有效的控制。但常见的肠道传染病诸如通过水和食品为媒介引起的食物中毒、伤寒、菌痢 ,却每年都有发生 ,甚至有时是暴发流行。水和食品中致病菌的分离是一个比较复杂的过程。样品中的致病菌数量很少 ,再加上样品 Since the founding of new China, the incidence of various infectious diseases, especially potent infectious diseases, has been effectively controlled. However, common intestinal infectious diseases such as food poisoning, typhoid and bacillary dysentery caused by water and food-mediated diseases occur every year, sometimes even outbreaks. The separation of water and foodborne pathogens is a complicated process. The number of pathogens in the sample is small, plus the sample