<prompt> IL-6 is persistently raised in?-Kawasaki diseaseViral encephalitisHIV encephalitisBehcets disease  <response>: Increased cerebrospinal fluid CSF IL-6 has been repoed in patients with Behcets disease BD and neurological involvement. CSF IL-6 seems to be a marker of disease activity and long-term outcome for pNB along with CSF cell count and protein levels. CSF IL-6 could be used in chronic progressive patients who have normal CSF cell, or protein levels to detect disease activity. Ref: Medscape 