IFN-γ was measured at the baseline and day 17, [Baseline Mean (SD) 0.016 (0.025) and day 17 Mean (SD) 0.13 (0.12)] and COVID-19 IgG and IgM measured at the baseline (0.157/0.264), days 17 (0.352/0.207), 34 (0.220/0.231), or 60 (0.24/0.25), did not show any activity indicating active exposure to SARS-CoV-2 virus during the dates measured. This evidence concerns the gene IFNG and COVID-19.