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人们生活的空间环境,微生物包括各种致病菌无时不在、比比皆是。人与微生物同处一环境之中,并相互影响和促进。通常,婴儿出生时是无菌的,后来与自然环境、空气和食物等接触后很快就有细菌定植于人体,并构成正常的微生物群体,其数量之多约为人体自身细胞总数的10倍。可是,正常人并不患病,这一事实证明了人的有机体已与正常菌群作为一个有机整体存在。人与菌互相依赖,同生共长,人为正常菌群提供定植条件和营养,而正常菌群对维持人体健康承担着诸多功能:一是营养功能。如
People living space environment, microbes, including a variety of pathogens all the time, abound. People and micro-organisms in the same environment, and mutual influence and promotion. Normally, the baby is sterile at birth, and bacteria colonize the body soon after coming into contact with the natural environment, air and food, and form a normal microorganism population, which amounts to about 10 times the total number of human own cells . However, normal people do not get sick, a fact that the human organism and the normal flora as an organic whole existence. Human and bacteria depend on each other, live and work together, artificial colonies provide colonization conditions and nutrition, and normal flora to maintain human health has many functions: First, nutritional function. Such as