This finding is similar to previous results in postinfectious non-COVID-19 ME/CFS in which severity of fatigue correlated with AABs against ADRB1/2, EDNRA, and AGTR1 (29); BDKRB1 and CHRM5 were not analyzed in this previous study. Here, ADRB1 is linked to myalgic encephalomeyelitis/chronic fatigue syndrome.