TNF and myalgic encephalomeyelitis/chronic fatigue syndrome: In patients with a severe ME/CFS a median (IQR), the IL-6 level was 1.5 (5.2–1.1) pg/ml, TNF-α–103 (150.7–44.7) pg/ml, IL-12–19.9 (37.3–15.5) pg/ml and IL-10 level was 35 (90–8.8) pg/ml.