Interestingly, a similar mechanism of action via an influence on balancing between type-1 (inflammatory) or type-2 (anti-inflammatory) immune response, as for vitamin D concentration, can be associated with the top hit of our coherence analysis between COVID-19 and serum calcium levels, the Bonferroni significant gene HGFAC, cf., Table 2. This evidence concerns the gene HGFAC and COVID-19.