A 53-year-old male renal transplant recipient receiving tacrolimus and prednisone presents with acute sigmoid diverticulitis with specks of free air and a 5-cm pelvic abscess which is not amenable to percutaneous drainage. His vital signs are a temperature of 102.0°F (38.9°C), heart rate 105 beats/min, blood pressure 110/80 mm Hg, and white blood cell count 18,000/µL (18109/L). The best next step in management is:
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