NCR3 and cytomegalovirus infection: Data on the expression of several activating receptors such as NKp30, NKp46, DNAM-1, CD16 and killer-cell immunoglobulin-like receptors (KIR) on NK cells of CLL patients are inconsistent.13–17 One possible confounder that could explain inconsistent results on NK cell phenotype in CLL is cytomegalovirus (CMV) infection.