CD8A and rheumatoid arthritis: Among them, an anti-viral response is reported in RA patients with an oligoclonal enrichment of Epstein–Barr virus (EBV)- and cytomegalovirus (CMV)-specific CD8 TRM cells together with an HLA class I restriction in up to 15% in synovial fluid as compared to ~1% in peripheral blood [27,30,31,32,33,34].