EDNRB and infection: In patients with infection-triggered onset (n = 86), severity of fatigue correlated positively with most AAB/IgG ratios, including those against alpha1/2-AdR, beta1/2/3-AdR, M3/4-AChR, AT1-R, ETA-R and ETB-R, but not PAR-1/2 (Figure 1A, black bars).