A 25-year-old male presents with fever, headache, photophobia, and nuchal rigidity. CSF analysis shows WBC 1,200 cells/µL (predominantly neutrophils), glucose 30 mg/dL (serum glucose 90 mg/dL), and protein 180 mg/dL. What is the most likely causative organism in this age group?
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A
Neisseria meningitidis
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B
Streptococcus pneumoniae
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C
Listeria monocytogenes
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D
Haemophilus influenzae