The effects of carvedilol on heart rate and blood pressure on days 7 and 14 (n = 8 in each group). a, heart rate; b, systolic blood pressure; c, diastolic blood pressure. ▲, Control; ◆myocarditis; ●carvedilol treatment. Control, normal mice treated with normal saline solution; Myocarditis, infected mice treated with normal saline solution; Carvedilol, infected mice treated with carvedilol. *P<0.05 versus control; §P<0.05 versus myocarditis.