In addition, no differences of IFN-α (P > 0.05, Fig. 1d), IL-6 (P > 0.05, Fig. 1e) and MIF (P > 0.05, Fig. 1f) were observed on day 6–7 and on day 8–10 of illness between mild and severe dengue patients. Here, IL6 is linked to dengue disease.