Logistic regression analysis revealed that the VDR Fok I FF genotype and F allele were independent risk factors for COVID-19 among the studied patients (adjusted OR: 4.3; [95% CI: 2.6–9.2]; P < 0.001, for the Fok I FF genotype and adjusted OR: 2.25; [95% CI: 1.1–3.7]; P = 0.003 for the F allele) controlling for age, sex, season at enrollment, and household crowding; Table 5. Here, VDR is linked to COVID-19.