伤寒的带菌现象,十九世纪末叶已被研究者所发现。但对带菌状态的本质,至今不明。当用细菌学方法,进行伤寒慢性带菌者的粪便培养时,往往不能经常的查出伤寒杆菌,呈间歇排菌现象。有人认为,这种现象的真实性尚值怀疑。认为这通常是由于细菌学检验方法和收集处理检验材料的技 Typhoid infection, the late nineteenth century has been researchers found. But the nature of the status of the carrier, so far unknown. When using bacteriological methods to carry out fecal culture of chronic carriers of typhoid fever, it is often not possible to detect typhoid bacilli in an intermittent row of bacteria. Some people think that the authenticity of this phenomenon is still doubtful. This is generally believed to be due to bacteriological test methods and techniques for collecting and processing test materials