I don't think it's undisclosed. It's pretty well known now that a very small minority of the population, mainly among the young, will suffer heart inflammation from the vaccine (and likely from covid as well). That's why they make you wait 30 min following the jab in case there's an immediate reaction. But even if not, people need to watch for the next several weeks for any unusual symptoms like chest pains, shortness of breath, etc and if there is, should report to a doctor immediately. The inflammation can be treated with anti inflammatory drugs and even otherwise in most cases should resolve on its own in a few weeks. They should especially not physically exert themselves during this period. This is important. Unfortunately many choose to ignore the warning, or are unaware of the risks in which case it would be the healthcare provider's fault.
They make you wait 30 minutes after you get the vaccine shot to see if you don’t have anaphylactic reaction. Not to see if you will get cardiac tissue inflammation.
That comes later.
Also the opinion that myocarditis or pericarditis is treatable just means the patient doesn’t have to be watched in the hospital as the symptoms have subsided enough.
Long term followup has not been done yet.(not enough time has passed). I am unaware of any studies looking for LONG TERM evidence of sunclinical myocarditis in afflicted individuals...vaccinated or not.Could be illuminating.
My GUESS is that there will be inflammation in any tissue that presents spike protein to the immune system....vaccinated or if natural infection. Why would anyone mandate a potential harmful drug to anyone and force them to take repeated doses?
No, it's actually well-known now that everyone getting the 'clot shot' gets the heart condition from the spikes.