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SARS-CoV-2-Specific IgG Levels Are Inversely Associated with ACPA-Reactive Pathological and Natural Autoantibody Profiles in Residual Diagnostic Samples

Background/Objectives: SARS-CoV-2-specific antibody levels vary among patients with systemic autoimmune rheumatic diseases (SARDs). In rheumatoid arthritis (RA), the most prevalent SARD, this is further shaped by rheumatoid factors (RFs). Attenuated post-vaccination antibody leve...