Ex vivo studies determined that G-MDSCs isolated from COVID-19 patients were able to suppress the proliferation of T lymphocytes previously stimulated with Staphylococcus enterotoxin-B [43,44] and inhibited the production of IFN-γ by CD3+ T lymphocytes stimulated with SARS-CoV-2 Spike and Nucleocapsid-derived peptides [43]. Here, IFNG is linked to COVID-19.