IFNG and myocarditis: We also prioritize the use of glucocorticoids (e.g., dexamethasone) for post-COVID-19 vaccine myocarditis for the following reasons: (1) glucocorticoids has been used successfully for the treatment of acute and chronic myocarditis, including viral myocarditis [27,63,64,65,66,67,68,69], (2) glucocorticoids lead to the inhibition of IFN-gamma by regulating STAT1 expression [19], (3) dexamethasone is one of the drugs that reduces COVID-19 mortality.