VDR and infectious disease: Five VDR SNPs (restriction fragment length polymorphisms identified using the enzymes Fok1, Bsm1 (GenBank rs1544410), Apa1 (GenBank rs7975232), Taqα1 (GenBank rs731236), and Cdx2 (GenBank rs11568820)) result in differential gene transcription and are associated with changes in bone mineral density, calcium absorption, vitamin D-related disease conditions, metabolic disorders, and susceptibility to infectious diseases [16], [18]–[21].