"In conclusion, using active surveillance, mRNA-1273 vaccine-associated mild transient myocardial injury was found to be much more common than previously thought. It occurred in one out of 35 persons, was mild and transient, and more frequent in women versus men."

1 in 35 were injured.

Note: We know heart muscle doesn't really repair itself well. Damaged muscle is replaced with scar tissue. So beware of the "transient" assertion.

https://www.uclahealth.org/departments/medicine/cardiology/r....