Fig. 2
Immunohistochemical characteristics of myocarditis in COVID-19. A - CD 3 lymphocytes in myocardial stroma (more than 7 CD3+ lymphocytes per 1 mm2), B - CD68 macrophages in myocardial stroma, C - absence of CD20 expression, D - pronounced TLR 4 type expression in cardiomyocyte cytoplasm, endothelium and infiltration cells; E - weak TLR 9 type expression in cardiomyocyte cytoplasm, single macrophages; F - absence of NK cells (perforin expression). Immunoperoxidase method with diaminobenzidine, magnification × 600 (a,d), × 200 (b,c,e), × 100 (f)