Review Question - QID 211715

A 51-year-old male with type 2 insulin-dependent diabetes who has a 2-week history of redness and swelling along the forefoot. Despite being currently treated with intravenous (IV) antibiotics, the redness has rapidly spread proximally into the lower leg in the past 12 hours. His laboratory values include an ESR of 80 mm/h (range, 0 to 20 mm/h), CRP of 6.2 mg/L (range, 0.08 to 3.1 mg/L), WBC of 15 (range, 4.500 to 11), and albumin level of 1.6. Which microorganism(s) is most commonly present in this condition?