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Morphological presentation of fatal myocarditis in a 17-month-old patient B after cardiac B19V infection. (A) Masson’s trichrome staining of heart tissue shows acute myocarditis with myocyte necrosis, many CD3+ T cells (B) and CD68+ macrophages (C) comparable to findings in patient A. (D) Detection of B19V DNA (black signals) via radioactive ISH in the endothelium of a cardiac vessel.
