Skin, Soft Tissue, & Bone Infections

53M has sudden onset of left calf pain. Within hours, skin and subcutaneous tissues are red, edematous, and tender. Red streaks are seen spreading proximally. A short time later, he is brought to the hospital with confusion and hypotension. Temperature is 40 degrees Celsius, with diffuse erythema of the skin. He is tachypneic. His wbc is 3000 ................
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