伤寒是由伤寒沙门氏菌引起的一种急性肠道传染病，主要发生于学龄儿童、青壮年以及旅游者。伤寒杆菌主要通过污染的食物、蔬菜及水传播，人是唯一的天然宿主。甲、乙型副伤寒沙门氏菌感染也可引起与伤寒相似的临床症状。在伤寒地方性流行区，伤寒病例占９０％，副伤寒病例... Typhoid fever is an acute intestinal infection caused by Salmonella typhi and occurs mainly in school-age children, young adults and tourists. Salmonella typhi mainly through contaminated food, vegetables and water spread, people are the only natural host. A, Paratyphoid B Salmonella infection can also cause clinical symptoms similar to typhoid fever. In typhoid endemic areas, typhoid cases account for 90% of cases of paratyphoid fever.