A study conducted by Jahromi et al.14 reported the expression profile for several groups of activator and suppressor NK cell receptors on the surface of 28.4+ IEL-NK cells using a qPCR approach and demonstrated that very virulent IBDV (vvIBDV) suppressed the activator receptors at 1-day post infection (dpi), but an overexpression of the surface activator was observed at 3 dpi. Here, KLRD1 is linked to infection.