Necrotizing fasciitis

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Summary of Necrotizing fasciitis

Necrotizing fasciitis is a rapidly progressing, life threatening soft tissue infection caused by a toxin producing bacterium, characterized by widespread fascial necrosis and relative sparing of underlying muscle. These patients feel much worse than suggested by their clinical appearance and may demonstrate systemic signs of sepsis including fever, dehydration, hypotension, and electrolyte imbalance.

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Necrotizing fasciitis

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Necrotizing fasciitis

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USMLE® Step 1 style questions USMLE

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USMLE® Step 2 style questions USMLE

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Preview

A 35-year-old woman comes to the emergency department because of pain and swelling of her right lower extremity for the past day. She says that she had a fall two days prior which resulted in a puncture wound to her right lower extremity from landing on a fallen branch. Physical examination shows redness, swelling, paresthesias, a large area of gangrenous skin, and crepitus upon palpation in the right lower leg. Within hours the area of redness extends towards the right knee and right thigh with extreme tenderness on exam. Which of the following organisms is most likely to be found in this patient's wound?

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