IL6 and dengue disease: Thus, the dynamics of serum IL-6, IL-10 and IFN-α levels and IL-37b-producing monocytes in DF patients were investigated, and results showed that the level of IFN-α in serum was negatively correlated with IL-37b-producing monocytes (P < 0.05) (Fig. 4A), while the levels of IL-37b, IL-6 and IL-10 had no correlation with IL-37b-producing monocytes (P > 0.05) (Fig. S3A–C).