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Bacteriology

Bacteroides and Fusobacterium

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SAMPLE QUESTION

A patient with fever and lower abdominal pain has a collection adjacent to a thickened sigmoid segment and several small pockets of extraluminal gas. Aspirated pus grows B. fragilis and E. coli. There has been no recent abdominal procedure, and no urinary or skin source is identified.

Which reservoir and route most likely supplied the organisms to this abdominal collection?