IFNG and COVID-19: Considering the upper 95% CI of IFN-γ SARS-CoV-2 S protein-specific production among unexposed individuals, it was established a cut-offIFN-γ point at 0.562 IU/mL and considering the lower 95% CI of PHA production among COVID-19 individuals, it was established a cut-offPHA at 3.47 IU/mL.