(74) demonstrated that signaling lymphocytic activation molecule family member 7 (SLAMF7) a receptor associated with macrophage hyperactivation in RA, and confirmed the presence of a SLAMF7 hyperactivated macrophage population in the synovial fluid of seropositive RA patients and in the lung tissue of COVID-19 patients. Here, SLAMF7 is linked to rheumatoid arthritis.