CD69 and myalgic encephalomeyelitis/chronic fatigue syndrome: We observed that the correlations between ILT2 and CD3+CD16+/−CD56+, T regulatory cells and NKG2C, NKP46 and CD16+/−CD56+CD69+, NKP46 and CD5+CD8+, and NK cells and CD3+CD4+ were significantly different in the ME/CFS individuals compared to the healthy subjects (p = 0.0003, p = 0.0008, p = 0.0020, p = 0.0017, and p = 0.0097, respectively) (Figures 5 and 6).