Review Question - QID 206591

A 47-year-old female presents to the emergency department in distress with a wound on her right lower leg. The patient describes intense pain over the site yesterday that has since dissipated; she is now insensate and not in pain. She also states that the area has been changing colors from first red to now purple/black. She reports having been stung by a bee near that spot 2 days ago. Her medical history is significant for type II diabetes, which is controlled with glipizide, and chronic headaches, for which she regularly takes naproxen. Her vital signs are as follows: T 38.9 C, HR 109, BP 80/57, RR 22, and SpO2 96%. Physical examination shows a 5cm x 12cm wound over the anterior right lower leg that is discolored purple and black towards the center of the wound with expanding edema and erythema towards the edges (Figure A). The area is insensate to light touch and pin-prick. No crepitus is noted on palpation of the wound. Which of the following is the most likely causative organism in this patient's presentation?