CD4 and lymphopenia: Recently, Chen et al. have demonstrated that, acute SARS-CoV-2 infection is connected with lymphocytopenia (with low CD4+ and CD8+ T-cells levels), increased levels of cytokine IL-2, IL-6, IL-10, TNF-α, and CCL2, and decreased expression of IFN-γ in CD4+ T-cells, similarly to SARS-CoV infection [29].