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Retired NBME Free 120 Answers

free120/Block 1/Question#34 (reveal difficulty score)
A 31-year-old woman with type 2 diabetes ...
ฮฑ-Toxin ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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submitted by โˆ—bwdc(697)
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Gram-positive rods in a diabetic foot wound (or a World War I soldier fighting in a trench) means Clostridium perfringens (the causative organism of gas gangrene). Crepitus means gas in the tissues, which is produced as a byproduct of its highly virulent alpha toxin.

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 +2  upvote downvote
submitted by myriad(2)
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I was vacillating between this patient having Bacillus Anthracis vs. Clostridium Perfringes. What exactly pushes it over the edge for C Perf? Is it the crepitus?

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sgold11  Yep! +1
athenathefirst  And for bacillus anthracis, the toxin responsible for the black eschar is an EXOTOXIN. +



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