In this contest, the analysis of many polymorphism, such as CCR5 (chemokine receptor 5), MCP-1 (monocyte chemoattractant protein 1), IL10 (interleukin 10), DC-SIGN (dendritic cell-specific molecule-3-grabbing non integrin), highlighted a correlation between certain of these SNPs and an increased risk of CMV infection in patients who underwent Allo-SCT [19,20]. Here, CCR5 is linked to cytomegalovirus infection.