KLRC2 and cytomegalovirus infection: Our present data showed that PHI subjects without current HCMV infection also had a higher proportion of NKG2C+ NK cells, but the anti-HCMV IgG antibody titers in PHI subjects were higher than in the NC group, and the proportion of NKG2C+ NK cells was increased in the group with higher anti-HCMV IgG antibody titers.