A 22-Year-Old Man Comes to the Office Due to Several

A 22-year-old man comes to the office due to several small, pruritic skin pustules on his lower extremities.  The patient first noticed the lesions a week ago during a trip to New Mexico, where he hiked in the mountains and swam in a heated hotel pool.  He was given trimethoprim-sulfamethoxazole at an urgent care center, but the pustules have persisted despite taking the medication as prescribed for 3 days.  The patient has no chronic medical conditions and takes no other medications.  Temperature is 37.9 C (100.2) , blood pressure is 132/68 mm Hg, and pulse is 96/min.  Examination shows several small, tender papulopustules on the bilateral lower extremities.  Which of the following pathogens is the most likely cause of this patient's symptoms?

A) Group A Streptococcus
B) Methicillin-sensitive Staphylococcus aureus
C) Pseudomonas aeruginosa
D) Sporothrix schenckii
E) Vibrio vulnificus

Correct Answer:

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