KLRC2 and myalgic encephalomeyelitis/chronic fatigue syndrome: We observed a significant correlation between the expression of NKG2C and IgG-HCMV antibodies (HS rho = 0.48, ME/CFS rho = 0.13, p = 0.048) so higher values of IgG-HCMVH antibodies would be accompanied with lower NKG2C expression in ME/CFS patients than in the HS cohort.