IFNG and COVID-19: A recent study confirmed that Peptide 2 probably has a strong cell-mediated immunological function in man; a 9-mer (YLQPRTFLL) peptide overlapped by Peptide 2 could induce a high level of IFN-γ expression from PBMCs of patients who had recovered from COVID-19 and carried the HLA-A*02:01 allele [29].