Vasculitis subtype was not associated with fatigue (p = 0.59), but a trend was evident for serotype, with 59.2% (16/27) of AAV-CFS patients being MPO-ANCA positive, compared to 40.7% (11/27) PR3-ANCA positive (p = 0.08) (Table 3). Here, PRTN3 is linked to myalgic encephalomeyelitis/chronic fatigue syndrome.