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Review Question - QID 6427

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QID 6427 (Type "6427" in App Search)
Following an uneventful primary total knee arthroplasty, an otherwise healthy 60-year-old woman does well for 3 years. She is now being evaluated for new knee pain that started 5 weeks ago following an upper respiratory tract infection. Examination reveals an effusion in the knee, the C-reactive protein is elevated, and an aspiration reveals a WBC count of 15,000/mm3 and gram-positive cocci. What is the next most appropriate step in management?