Well this should clear up all the controversies. From Tyler Durden at zerohedge.com:
Why is Big Pharma investigating their own covid vaccines for myocarditis side effects if the vaccines were already supposedly tested and proven safe and effective?
Both Pfizer and Moderna have announced that they will be undertaking studies to determine the longer term risks of Myocarditis (an inflammatory condition of the heart which can lead to death) for people who have been injected with the mRNA based covid vaccines. The decision comes after the release of multiple medical studies which show a correlation and causation between the vaccines and an exponential increase in heart problems, specifically among men 40 years old and younger. Only a year ago the link between covid vaccinations and myocarditis was widely denied.
Studies also show that myocarditis risk increases with the number of boosters a person has taken.
Before the year 2020, the average vaccine was tested and re-tested by pharmaceutical companies and the FDA for 10 to 15 years before it could be released to the public. This was done not only because testing is a complex process with a lot of red tape involved, but also because it is the only way to discover any long term side-effects that might be associated with a particular immunization product. If you read any medical journal or scientific outline on vaccine development published before 2020, they all agree that long term testing is necessary for public safety.