Diagnose me if you can!
A 20 year old male was presented to the emergency department in unconscious state. On history as per relatives, patient had high grade fever for the last 5 days, altered sensorium for 3 days and 1 GTCS in morning.
On examination, decerebrate response to deep painful stimulus. Pupil size normal and reactive to light bilaterally.
CECT brain study was normal.
CSF study was done.
CBC was also done.
What are your diagnosis?
Which test would you perform to confirm your diagnosis?