KIR3DL1 and viral infectious disease: A correlation between KIR2DL5 and CMV was observed in renal transplantation, where patients carrying the KIR2DL5 gene were more prone to CMV infection [33], but was not clearly proven in HSCT, where the virus infection seems to be controlled by the whole spectrum of KIRs and the level of interaction of KIR and their ligands [34].