IFNG and COVID-19: The CD4+ T cells showed significant staining for IFN-γ, with five out of six subjects generating IFN-γ+CD4+ T cells responses to at least one of the SARS-CoV-2 peptide N, M, or S pools, indicating that convalescent COVID-19 patients have solid SARS-CoV-2−specific CD4+ T cell immunity.