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A 17-year-old boy presents to the clinic with complaints of vomiting and dizziness since yesterday. He also complains of multiple episodes of diarrhea. The travel history is insignificant except for a visit to the countryside two days back where he had smoked chicken for lunch. On presentation, he has a pulse rate of 84 bpm, a blood pressure of 90/70 mmHg, a respiratory rate of 17 breaths/min, and he is afebrile. The physical examination does not reveal any significant findings. He has a Hb level of 11.5 g/dl, a TLC of 9500/mm3, and a platelet count of 365,000/mm3. A stool specimen sent for microscopic evaluation reveals spiral-shaped motile gram-negative rods. Which of the following would have the most significant role in the initial management of this patient?

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