CD68 and viral myocarditis: Cardiac autopsy from the patients with COVID-19 has shown that, unlike traditional viral myocarditis which mainly involves lymphocytic infiltration, there are more CD68+ cells in the heart of the patients with COVID-19, and CD68+ cells are widely distributed in the myocardium and epicardium of the heart, suggesting an important role of macrophages in COVID-19 infection-induced cardiac injury (147).