IFNG and COVID-19: The observed representation of the specificities of T-cells producing IFN-γ upon antigen stimulation of PBMCs in culture (Figure 1) after COVID-19 corresponds to the presentation in the MHC complexes of the epitopes of all proteins of the SARS-CoV-2 virus developing inside the cells of the body and reflects a higher level of T-cell response to antigens of proteins included in the AG2 set, specifically, the N-protein [41] or ORF1 and ORF3 proteins [42].