临床送检的标本作厌氧培养发现约1/3标本系厌氧菌,另1/3兼有厌氧与需氧菌。在分出的厌氧菌中约半数为革兰氏阴性厌氧杆菌,其中85～90%系类杆菌(Bacteroides)。在类杆菌中则50～60%为耐青霉素的脆弱类杆菌(B.fragilis)。厌氧性链球菌可单独出现或与厌氧杆菌同时存在。革兰氏阳性无芽胞厌氧杆菌约占厌氧菌的1/3,常见的有真细菌与棒状杆菌。 Clinical specimens were anaerobically cultured for about 1/3 of specimens found anaerobic bacteria, the other 1/3 both anaerobic and aerobic bacteria. About half of the anaerobic bacteria are Gram-negative anaerobes, of which 85-90% are Bacteroides. In Bacteroides, 50 to 60% is penicillin-resistant B. fragilis. Anaerobic streptococci can appear alone or with anaerobic bacteria exist. Gram-positive anaerobic bacilli account for about anaerobic bacteria 1/3, common with eubacteria and coryneform bacteria.