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Review Question - QID 1369

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QID 1369 (Type "1369" in App Search)
A 56-year-old diabetic male presents to the emergency department by ambulance after developing high-grade fevers, malaise, and altered mental status. Upon presentation, he is found to be hypotensive and initial labs show an elevated WBC with a profound left shift. Figure A shows skin manifestations confined to the foot at initial presentation. He is started on broad spectrum antibiotics. Upon follow-up exam 3 hours later his clinical condition deteriorates (Figure B) and he is taken to the operating room for surgical debridement. In a bacterial culture, what would be the most common single isolate for this condition?
  • A
  • B

Staphylococcus aureus

18%

440/2388

Staphylococcus epidermidis

2%

47/2388

Group A streptococcus

74%

1769/2388

Enterobacteriaceae

1%

26/2388

Pseudomonas

4%

89/2388

  • A
  • B

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The above clinical vignette is describing necrotizing fasciitis. Necrotizing fasciitis is a rare and often fatal soft-tissue infection that requires high clinical suspicion and prompt administration of broad-spectrum antibiotics and aggressive surgical debridement (illustrations A). Fontes et al found that although polymicrobial infections including gram-positive, gram-negative, aerobic, and anaerobic bacteria were found most commonly in necrotizing fasciitis, Group A streptococcus was the most common bacterial isolate. Wong et al also found the most isolated organism to be group A streptococcus. In their study, the highest associated medical comorbidity was diabetes mellitus (71%). They found that delay in surgery of more than 24 hours was correlated with increased risk of death.

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