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A 6-year-old male presents with complaints of loose stools. He has developed multiple episodes of loose stools since morning that are watery and voluminous. There is no significant past medical history, but the family returned from a trip to Bangladesh 2 days ago. His examination reveals a blood pressure of 70/30 mmHg, a pulse of 140 beats per minute, a respiratory rate of 25 breaths per minute, and a temperature of 36.6 C (98 F). The patient is lethargic, and skin turgor is markedly reduced. Intravenous fluid replacement is started. His investigations revealed a WBC count of 12,000 per microL, hemoglobin of 11 g/dl, platelet count of 250,000 per microL, and a C reactive protein level of 70 mg/dl. Stool microscopy reveals gram-negative curved rods. Administration of which of the following should be considered in this patient?

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