According to clinical studies, an abnormal concentration of various cytokines (such as TNF-α, IL-6, IL-8) and an excessive release of reactive oxygen species in COVID-19 could cause an overactive immune response in COVID-19 (Behrens & Koretzky, 2017; Huang et al., 2020; Pedersen & Ho, 2020). Here, TNF is linked to COVID-19.