IL6 and myalgic encephalomeyelitis/chronic fatigue syndrome: With regards to levels of IL-2, IL-8, IL-17 A and TNF-α (the cytokines that were regulated by IFN-α but did not distinguish between PF and RF), for IL-2 there were no significant differences between groups (p =  0.14), while for the others there were significant differences between the groups (p values ranging <0.001 - 0.003, see Table 2), and differences were all similar to those described for IL-6 and IL-10, i.e., higher in both PF and RF groups compared with CFS and controls, but not different between PF and RF or between CFS and controls.