NKG2A is a receptor expressed on NK cells that induces IFN-γ and TNF-α (André et al., 2018; van Eeden et al., 2020b), and NKG2A expression by NK cells is activated in the peripheral and pulmonary microenvironment of patients with COVID-19 (Hammer et al., 2022). This evidence concerns the gene TNF and COVID-19.