A 43-year-old Asian man presents with headache and neck stiffness. CT brain is normal and a lumbar puncture is performed with the following results
Serum glucose 4.7 mmol/l
Lumbar puncture reveals:
Opening pressure 15 cmCSF
Appearance Cloudy
Glucose 3.3 mmol/l
Protein 0.7 g/l
White cells 100 / mm³ (70% lymphocytes)
What is the most likely diagnosis?