| Bacteroides pneumosintes | A species found in the nasopharynx, gingival crevice and periodontal pockets, blood, respiratory tract, brain abscesses, and head and neck infections. (05 Mar 2000) |
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| Bacteroides praeacutus | A species isolated from the intestinal tracts of infants and adults, gangrenous lesions, lung abscesses, and blood. Synonym: Tissierella praeacuta. (05 Mar 2000) |
| Bacteroides putredinis | A species isolated from faeces, cases of acute appendicitis, and abdominal and rectal abscesses; also from foot rot of sheep and from farm soil. (05 Mar 2000) |
| Bacteroides thetaiotamicron | A species implicated in intra-abdominal infections. (05 Mar 2000) |
| Bacteroides ureolyticus | A species isolated from infections of the respiratory and intestinal tracts, and from the buccal cavity, intestinal tract, urogenital tract, and blood after a dental extraction. (05 Mar 2000) |