<s>[INST] A 43-year-old man presents with a 2-day history of severe headache, nausea, and fever. On physical examination, he is found to have nuchal rigidity. Lumbar puncture is performed and the cerebrospinal fluid (CSF) is cloudy and contains 500 white blood cells/\(\mu\)L (90% polymorphonuclear cells), protein of 75 mg/dL, and glucose of 25 mg/dL. Which of the following is the most likely diagnosis?[/INST]