As shown in Table 2, VDR polymorphisms including FokI (rs2228570, exon 2, C > T), TaqI (rs731236, exon 9, A > G) and BsmI (rs1544410, intron 8, G > A) were shown to be associated with the risk of COVID-19 and severity in more than one observational study [102,103,108,109,110,111,112]. Here, VDR is linked to COVID-19.