CCL2 and myalgic encephalomeyelitis/chronic fatigue syndrome: Significantly worse CFS than those with CCL2 < 280 pg/mL (median CFS: 136.4 vs. not reached, respectively; HR = 0.10; and p = 0.0007) (Figure 3A) was demonstrated in patients with CCL2 ≥ 280 pg/mL.