The introduction of an improved anaerobic system resulted in the isolation of Bacteroides ureolyticus (B corrodens) in numbers that suggested a pathogenic role from many more clinical specimens. During a three-year period B ureolyticus was isolated from 103 fairly superficial necrotic or gangrenous lesions all of which showed evidence of active infection. These included 27 perineal or genital infections, 15 perianal abscesses, 15 other soft tissue infections such as pilonidal abscesses and infected sebaceous cysts and 16 ulcers or gangrenous lesions of the lower limb. B ureolyticus was rarely isolated in pure culture but was usually one of the predominant organisms; the other organisms were mostly anaerobes and the combination of B ureolyticus with anaerobic Gram-positive cocci was particularly noticeable. The isolation and identification of B ureolyticus is not difficult but depends upon a reliable anaerobic system and the incubation of primary cultures for at least 72 h.
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