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A 66-year-old male with a surgical history of left total knee replacement 2 weeks ago presents to the emergency department with left knee pain and swelling. The pain started two days ago and has progressively worsened. His left knee movements are restricted on physical examination. His vital signs include a blood pressure of 90/60 mmHg, respiratory rate of 14/min, heart rate of 100/min, and temperature of 101°F. Arthrocentesis reveals a cloudy fluid, with initial culture data reported as positive for gram-positive organisms that are catalase-positive and coagulase-positive. Antibiotic sensitivities are pending. Blood cultures obtained on arrival reveal similar results within a few hours of incubation. An intravenous isotonic fluid bolus is started. What is the next best step in the management of the patient?
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