Correlation of CD3+ T cell infiltration and B19V DNA copies in children with acute and chronic myocarditis. (A) Comparison of CD3+ cell count in acute myocarditis without infection, other virus infections, and B19V infection between two age groups (0–2 years and 3–16 years). (B) Comparison of CD3+ cell count in chronic myocarditis without infection, other virus infections, and B19V infection between two age groups (0–2 years and 3–16 years). (C) Correlation of CD3+ T cell infiltration with viral DNA load in the myocardium (blue) and BC (red). (D) Correlation of CD3+ T cell infiltration with viral load in the myocardium (blue) and plasma (red). CD3+ cell count is presented as the number of cells per mm2. B19V DNA load is given as the number of copies per µg of DNA (heart or BC) and per ml of plasma. Data are presented as mean ± SEM; ns, not significant; * p < 0.05, and ** p < 0.01.