KLRD1 and cytomegalovirus infection: The NK cell receptors’ distribution is also altered by the postnatal symptomatic HCMV infection in preterm infants, which is characterized by an early increase of total NK cells, as well as NKG2C+ and KIR+ NK cell subsets with a simultaneous decrease of the cells expressing CD94/NKG2A receptor (Noyola et al. 2015).