Biao et al69–71 also showed that T cell counts of patients who recovered increased, while IL-6, IL-10 and TNF-α levels decreased.71 Since the cytokine increases were paralleled by a decrease in lymphocytes, Diao et al71 speculated that elevated proinflammatory cytokines may promote the reduction of T lymphocytes in patients with COVID-19. This evidence concerns the gene IL10 and COVID-19.