In female patients with COVID-19, 25(OH)D was inversely correlated with CRP (R = −0.51, p < 0.05), and borderline significant inverse correlations with IL-2 (R = −0.5, p = 0.06) and IL-17α (R = −0.36, p = 0.06) were observed. The gene discussed is IL2; the disease is COVID-19.