A 45-year-old male presents with acute onset of fever, headache, nuchal rigidity, and altered mental status. Lumbar puncture reveals cloudy cerebrospinal fluid with elevated protein, decreased glucose, and neutrophilic pleocytosis. Which of the following is the most appropriate empiric antibiotic regimen?

The correct answer to the question "A 45-year-old male presents with acute onset of fever, headache, nuchal rigidity, and altered mental status. Lumbar puncture reveals cloudy cerebrospinal fluid with elevated protein, decreased glucose, and neutrophilic pleocytosis. Which of the following is the most appropriate empiric antibiotic regimen?" is Option B: Vancomycin, ceftriaxone, and ampicillin.

The other options — A) Amoxicillin and ceftriaxone, C) Acyclovir and dexamethasone, D) Fluconazole and amphotericin B — are incorrect for this USMLE Exam Prep question. As explained above: This presentation is highly suggestive of bacterial meningitis. Empiric therapy for adults includes vancomycin (for resistant S. pneumoniae), a third-generation cephalosporin like ceftriaxone (for N.…