IL2 and COVID-19: IL-2, TNF and IFN-γ cytokine responses were replicated when using recombinant SARS-CoV-2 spike glycoprotein (Figure S4) instead of spike-derived peptide signifying the antigen-specificity of the response stems from the epitope within the 15mer of the spike glycoprotein of SARS-CoV-2, a protein which has been shown to elicit dominant T cell immune responses in COVID-19 infected individuals (22).