Polyautoimmunity: axSpA and Familial Mediterranean Fever by Dr. Rachel Tate ( @uptoTate ) Mysteries behind polyautoimmunity have confounded rheumatologists for decades. One such association, the co-existence of FMF and axSpA, remains rare. https://t.co/GbU1ikeyQw #ACR21 https://t.co/dRd6yxjieS