Review Question - QID 8488

Figure 31 is the T2-weighted MRI scan of an 11-year-old boy with a 7-day history of limping, pain in his right leg, and fevers. His MRI scan reveals soft-tissue swelling. The distal femur is tender to palpation, but there is no pain with hip or knee range of motion. He is unable to bear weight on his right leg. His temperature is 38.8°C, pulse 110, and blood pressure 120/70 mm Hg. Lab study results revealed a white blood cell count of 16000 cells/µL (reference range, 4500-11000 cells/µL), hematocrit 30% (reference range, 41%-50%), and C-reactive protein of 20 mg/L (reference range, 0.08-3.1 mg/L). A gram stain from a blood culture obtained in the emergency department showed gram plus cocci in clusters. What is the most appropriate empiric antibiotic treatment?