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EM@3AM: Bacterial Meningitis

A 21-year-old male is brought to the ED via EMS after a reported seizure. As per girlfriend, the patient began complaining of a headache yesterday, and today he is confused. He is febrile and tachycardic. He is confused and has nuchal rigidity. However, Kernig and Brudzinki signs are negative. CT is negative. What is most likely diagnosis, and what is the next step in diagnosis?