厌氧菌是指无氧条件下生长繁殖的一些细菌,分兼性厌氧菌与专性厌氧菌,前者在有氧与无氧条件下都可生长,如大肠杆菌、伤寒杆菌、痢疾杆菌等;后者在绝对无氧条件下才能生长、繁殖,如结核杆菌、绿脓杆菌等。按其结构特征又可分为芽胞与无芽胞厌氧菌。在临床上以无芽胞厌氧菌特别脆弱类杆菌致病性较强。 厌氧菌的分布:其是体内正常菌群的一部分,广泛存在于机体的体表和外通的腔道中,如口腔中厌氧菌占正常口腔菌群 Anaerobic bacteria refers to the growth and reproduction of some bacteria in anaerobic conditions, facultative anaerobic bacteria and obligate anaerobic bacteria, the former can be grown under aerobic and anaerobic conditions, such as Escherichia coli, Salmonella typhi, Shigella Etc .; the latter can grow and propagate under absolutely anaerobic conditions, such as Mycobacterium tuberculosis, Pseudomonas aeruginosa and the like. According to its structural characteristics can be divided into spores and non-spores anaerobic bacteria. Clinically non-spore anaerobic bacteria Bacteroides particularly pathogenic. Anaerobic bacteria distribution: It is part of the normal flora, widespread in the body’s body surface and the passage of the channel, such as oral anaerobic bacteria accounted for normal oral flora