Answer:USMLE step 2 Mcq 117: polymicrobial infection is a feature of

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Correct Answer: B

Explanation:
Tubo-ovarian abscess is usually a polymicrobial infection, whereas general pelvic infections may often be monomicrobial. Tubo-ovarian abscesses are usually a mixture of anaerobic, facultative anaerobic, and aerobic organisms, with the purest isolated generally being anaerobes. The most frequent isolates from TOAs include a variety of Enterobacteriaceae, such as Escherichia coli (37%), Bacteroides fragilis (22%), other Bacteroides species (26%), Peptostreptococcus (18%), and Peptococcus (11%).


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