With non-severe (non-ICU) COVID-19, there was increased expression of the viral entry gene (CTSL (p < 0.05)) and increased antiviral response genes (MX1 (p < 0.0001), SAMHD1 (p < 0.0001), TRIM25 (p < 0.01), IFITM3 (ns)). This evidence concerns the gene IFITM3 and COVID-19.