Soon after the first COVID-19 vaccines appeared in 2021, reports of rare cases of heart inflammation, or myocarditis, began to surface.
In most instances, the myocarditis has been mild and responded well to treatment, though up to four potentially mRNA vaccine-related deaths from myocarditis in adults have been reported worldwide. No known verified deaths of children have been reported based upon publicly available data. The exact number remains a topic of very heated debate because of variability in the reporting of possible myocarditis-related deaths.
