A 62-year-old man sees his physician because he has had fever and back pain for the past 2 days. Physical examination shows tenderness of the right costovertebral angle. Laboratory studies show leukocytosis and pyuria with WBC casts. He has been receiving antibiotic therapy with cefotaxime, clindamycin, and nafcillin for the past 16 days. He now develops lower abdominal pain and a severe diarrhea. Clostridium difficile toxin is identified in a stool specimen. Which of the following conditions is he most likely to have now developed?
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