A 20-year-old college student presents to the emergency department with a fever, severe headache, and neck stiffness for the past 12 hours. One of his roommates had the same symptoms 2 days ago. On examination, his temperature is 39.2°C (102.6°F), blood pressure is 110/70 mmHg, heart rate is 110 bpm, and he appears lethargic. Kernig's and Brudzinski's signs are positive.
What is the most appropriate next step of management?
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