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Review Question - QID 214468

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QID 214468 (Type "214468" in App Search)
A 57-year-old man with a history of HIV (CD4+ 257/mm^3) presents to the emergency department with acute left upper quadrant abdominal pain. The pain had been getting worse for 3 months but today suddenly his pain became 10/10. His temperature is 100.1°F (37.8°C), blood pressure is 140/80 mmHg, pulse is 94/min, and respirations are 19/min. On exam, he has pain to palpation in the left epigastrium. On abdominal CT he is found to have a 10 cm mass invading the left adrenal vein and splenic artery. He subsequently undergoes resection of the primary tumor and requires a left adrenalectomy and splenectomy. Post-operatively, his pain is well controlled, his diet is advanced, and he is able to ambulate. Upon discharge, antibiotics against which of the following pathogens should be started prophylactically?