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A 52-year-old woman comes to the emergency department due to recurrent left lower extremity swelling, pain, and erythema. The patient's medical history includes type 2 diabetes mellitus and depression. Her medications include metformin, paroxetine, and a multivitamin. The patient was diagnosed with cellulitis, admitted to the hospital, and started on antibiotics. She is continuing on her home medications. Three days later, the patient became agitated and delirious with severe abdominal cramps and diarrhea. Her temperature is 39.2 C(102.6 F), blood pressure is 180/100 mm Hg, and heart rate is 120/min and regular. The patient is diaphoretic and tremulous on examination, and her pupils are dilated. Bilateral hyperreflexia and ankle clonus are present. She begins to have seizures. Which of the following antibiotics was the patient most likely given to treat the cellulitis?