A 59-year-old woman comes to the emergency department because of a 2-day history of worsening fever, chills, malaise, productive cough, and difficulty breathing. Three days ago, she returned from a trip to South Africa. She has type 2 diabetes mellitus, hypertension, and varicose veins. Her current medications include metformin, lisinopril, and atorvastatin. Her temperature is 39.4°C (102.9°F), pulse is 102/minute, blood pressure is 94/68 mm Hg, and respirations are 31/minute. Pulse oximetry on 2 L of oxygen via nasal cannula shows an oxygen saturation of 91%. Examination reveals decreased breath sounds and dull percussion over the left lung base. The skin is very warm and well-perfused. The remainder of the examination shows no abnormalities. Laboratory studies show:Hemoglobin 11.6 g/dLLeukocyte count 15,400/mm3platelet count 282,000/mm3Serum Na+ 144 mEq/LCl- 104 mEq/LK+ 4.9 mEq/LCreatinine 1.5 mg/dLBlood and urine for cultures are obtained. Intravenous fluid resuscitation is begun. Which of the following is the next best step in management?

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