A young woman has a pelvic infection. A specimen contains bacilli that are bile salt tolerant, as shown by black growth on a bile- esculin agar plate. Her infection is likely caused by

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Bacteroides fragilis is a bile-resistant anaerobic bacterium that can grow on bile-esculin agar, producing black colonies due to esculin hydrolysis. It is a common cause of pelvic infections.

A Young Woman Has a Pelvic Infection