RetractionWatch.com: 137 retracted COVID-related studies
Real science is never settled, and anyone who has certainty on such things is not qualified to discuss it.
The amount of outright fraud in medical studies is at least 20%. But over and above that are other problems with studies, and it’s important to be aware of the numerous issues involved:
Sebastian Rushworth MD: How to understand scientific studies (in health and medicine)
As for COVID, there are 137 retracted COVID-related studies and counting.