TNF and COVID-19: It has been reported that COVID-19 induces higher plasma levels of cytokines including, but not limited to, IL-6, IL-2, IL-7, IL-10, tumor necrosis factor-α (TNF-α), IFN-γ-inducible protein, etc., in ICU patients with SARS-CoV-2 infection (Chen N. et al., 2020; Huang C. et al., 2020), which refers to a cytokine storm in patients.