IFNG and COVID-19: Of note, a recent study has shown that the magnitude of T cell responses to SARS-CoV-2 was similar between asymptomatic infections and symptomatic COVID-19 patients,35 but SARS-CoV-2-specific T cells produced a higher level of IFN-γ and IL-2 in asymptomatic patient,35 which is in line with our study.