1人体正常微生物菌群的概念与分布正常人体中存在着大量的微生物。除了母体中的胎儿外，世界上没有无菌的人。胎儿一旦出生，离开母体几个小时，皮肤、粘膜、呼吸道就会有微生物存在。据瑞典研究者Gustafsson报道，健康的人体内与外界隔绝的组织、血液中是不含细菌的；正常成年 A human body normal microbial flora concept and distribution of normal human body there is a large number of microorganisms. There is no sterile person in the world except the fetus in the mother. Once the fetus is born, leave the mother a few hours, the skin, mucous membranes, there will be microorganisms in the respiratory tract. According to Swedish researcher Gustafsson, tissues isolated from the outside world in healthy humans are bacteria-free; normal adults