Concentrations of various cytokines and soluble receptors. Concentrations of IFN-γ (A), sIL-2Rα (B), sTNFR1 (C), and sTNFR2 (D) were measured in the serum of control individuals and HPS patients during the acute phase or after remission of the disease. Box plot representation, horizontal line within boxes represents median. ○ indicates outside values (*P < .05, **P ≤ .001 compared with respective controls).