Serum levels of cytokines and receptors in humans with TBE virus infection. a, IL-1β; b, IL-1RA; c, TNF-α; d, sTNFRI; e, IL-6; f, sIL-6R; g, IL-10; IL-2. ▪ group 1, □ group 2, group 3. All examined parameters of group 1 are shown by day 21, as the hospitalization period in that group was longer in comparison with that in the groups 2 and 3. Data are mean ± SD.