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USMLE · Question #494
USMLE Question #494: Real Exam Question with Answer & Explanation
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Question
A 31-year-old woman with type 2 diabetes mellitus comes to the physician because of an oozing, foul-smelling wound on her foot for 2 days. Physical examination shows a 4-cm, necrotizing wound with a purplish black discoloration over the heel. Crepitant bullae producing profuse amounts of serous drainage are seen. A Gram stain of a tissue biopsy specimen shows gram- positive rods. The causal organism most likely produces which of the following virulence factors?
Options
- AEndotoxin
- BFimbriae
- CPneumolysin
- DPolysaccharide capsule
- Ea-Toxin
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