CD79A and spondylitis: Furthermore, no significant difference was found for the disease activity scores Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) (32) and Bath Ankylosing Spondylitis Functional Index (BASFI) (33) between early axSpA patients with, or without antibody reactivity against this panel of 3 UH-axSpA-IgA antigens.