The purpose of this work was to evaluate the changes of IL-1 beta and TNF-alpha serum concentrations among patients with TBE (tick-borne encephalitis) of mild and severe clinical course. The detection of cytokines was performed by immunometric assay twice before and after treatment. There was no significant changes in IL-1 beta serum concentration after treatment in both groups of patients. But concentration of TNF-alpha decreased significantly after treatment in both groups of patients. It seems that changes of TNF-alpha concentration might be helpful in evaluation of efficacy of aseptic central nervous system treatment.