Response to: 'Comparative analysis of synovial inflammation after SARS-CoV-2 infection' by Alivernini et al .

Few studies have described so far the occurrence of arthritis in patients infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).1 For this reason, we read with great interest the report by Alivernini et al 2 where they present two cases of polyarthritis in the context of a SARS-CoV-2 infection, with an exhaustive study of synovial tissue. In the immunohistochemical study of both biopsies, they observed inflammatory infiltrates mostly composed of CD3+, CD138+ and CD68+ cells. Furthermore, in the patient with rheumatoid arthritis, case 2, they also detected CD20+ cells. The study of synovial tissue in the context of SARS-CoV-2 arthritis is of …