傷寒和副傷寒,是夏季多見的肠胃傳染病,病原菌都是革蘭氏陰性的短桿菌,屬於沙門氏菌屬,在沙門氏菌屬中,除傷寒桿菌和副傷寒桿菌外,還有很多種其他的細菌,其中很多只能使動物生病,不能使人生病,有些既能使動物生病,也能使人生病,例如鼠傷寒沙門氏桿菌、腸炎沙門氏桿菌和猪霍亂沙門氏桿菌,除能引起動物生病外, Typhoid and paratyphoid, is more common in summer gastrointestinal diseases, pathogens are Gram-negative Brevibacterium, belonging to the genus Salmonella, Salmonella, in addition to Salmonella typhi and paratyphoid bacilli, there are many other bacteria , Many of which can only make animals sick, can not make people sick, some can make animals sick, but also make people sick, such as Salmonella typhimurium, Salmonella enteritidis and choleraesuis Salmonella, in addition can cause illness in animals outer,