1-MT promotes the viability of macrophages in VMC mice. * p< 0.05 vs. normal mice without any treatment; # p< 0.05 vs. CVB3-induced VMC mice. Statistical values were measurement data and analyzed using one-way ANOVA. n = 20 in the VMC group. n = 40 in the normal group. n = 14 in the 1-MT group. 1-MT was the inhibitor of IDO1. The experiment was repeated 3 times independently. VMC, viral myocarditis; IDO1, indoleamine 2,3-dioxygenase-1; CVB3, coxsackievirus B3; OD, optical density; ANOVA, analysis of variance.