IL33 and hemorrhagic fever with renal syndrome: Spearman correlation analysis revealed that this increasing level of IL-33 was correlated with increasing WBC count (r = 0.28, p < 0.05) (Fig. 2A) and viral load (r = 0.64, p < 0.05) (Fig. 2B) and decreasing PLT count (r = −0.44, p < 0.05) in HFRS patients (Fig. 2C).