Studies on serum cytokines in patients with COVID-19 have shown that the concentrations of many cytokines and chemokines, such as IL6, TNFα, CSFs, monocyte chemoattractant proteins (MCPs) and CXCL10 (5, 35), are elevated in response to SARS-CoV-2 infection and correlate positively with the severity of the disease (36, 37). Here, TNF is linked to COVID-19.