Definition: a bacterial species found in human and animal intestinal tracts. Although it represents only about 10–20% of Bacteroides species found in the colon, it is the primary species associated with intraabdominal abscesses and other subdiaphragmatic infections in humans, including peritonitis, rectal abscess, abdominal surgical wounds, and urogenital tract infection. Its capsule is capable of inducing abscess formation independently; characteristically, this species produces a β-lactamase that inactivates β-lactam antibiotics such as the penicillin and cephalosporin groups; it is the type species of the genus, Bacteroides.
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Examples: glitazone, GI cocktail, etc.