伤寒是由伤寒杆菌引起的急性肠道传染病。多见于夏秋季节,传染源是病人和带菌者。从传染源排出的粪便中的细菌,通过水以及被水、手和苍蝇所污染的食品,由口进入人体。供水系统的污染常造成地方性流行,污水灌溉使瓜果、蔬菜、贝类污染,发病率明显上升。 Typhoid fever is caused by Salmonella typhi acute intestinal infectious diseases. More common in summer and fall, the source of infection is the patient and carrier. Bacteria in the excrement discharged from sources of infection enter the human body from the mouth through water and food contaminated by water, hands and flies. Often caused by local water supply system pollution, sewage irrigation so that fruits, vegetables, shellfish pollution, the incidence rate increased significantly.