In the case-control analysis (Figure 2), serum levels of IL-17 were higher in ME/CFS patients than in controls (F1,73 = 5.901, p = 0.018, ηp2 = 0.075), while no differences between ME-CFS patients and controls was found concerning IL-4, IL-10, IL-18, and IFN-γ. Here, IFNG is linked to myalgic encephalomeyelitis/chronic fatigue syndrome.