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人体处于微生物包围的海洋中,体内也寄居各种细菌。全身虽仅有10~(13)个细胞,寄居在胃肠道的细菌即达10~(14)个,但人体有局部和全身性防御功能,对感染的防止有重要意义。抗生素的作用是减少入侵细菌的数量,以便宿主调动其防御功能,故斗争不是在抗生素和细菌之间,而是在细菌和宿主之间展开。局部防御功能最重要的第一线防御屏障是体内、外的上皮层。上皮有的有几层,如在皮肤、阴
The human body is surrounded by microorganisms in the ocean, the body also live in a variety of bacteria. Although the whole body is only 10 ~ (13) cells, bacteria residing in the gastrointestinal tract that is up to 10 to (14), but the body has local and systemic defense function, prevention of infection of great significance. The role of antibiotics is to reduce the number of invading bacteria in order for the host to mobilize its defense function, so the fight is not between antibiotics and bacteria, but between the bacteria and the host. The most important first-line defensive barrier for local defenses is the epithelial lining of the body and beyond. There are several layers of epithelium, such as the skin, overcast