it is inflammation not infection. I imagine the vast majority is asymptomatic and goes away with doing nothing. If it would be severe enough to decrease the hearts pumping ability there would me medication to treat the heart failure. some forms of damage would improve others might cause permanent damage . I doubt this is a common thing or we would be seeing more of it at this point
Thank you for the reply.
My oldest son has had COVID and some symptoms seem to be hanging around, mostly fatigue. But he is getting better.