Profiling serum cytokines in COVID-19 patients revealed that kinds of pro-inflammatory factors and anti-inflammatory factors including TNF-α, IFN-γ, IL-2, IL-4, IL-6 and IL-10 were significantly higher, and IL-6 and IL-10 can be used as predictors for fast diagnosis of patients with a higher risk of disease deterioration [24,25]. Here, IL6 is linked to COVID-19.