International organization. Provides website, educational conferences, webinars, and brochures for patients and caregivers. Funds research on etiology, pathogenesis, epidemiology, genetics, diagnosis, treatment, and disease management. VF funds 1 or 2 year clinical/research vasculitis fellowships. Published the 2021 ACR/VF Vasculitis Treatment Guidelines for EGPA, GCA, GPA, MPA, Kawasaki and Takayasu arteritis.