The first large peer-reviewed clinical trial published in NEJM in Dec 2020 had around 43,000 subjects and in that population there was about a 95% reduction in

The first large peer-reviewed clinical trial published in NEJM in Dec 2020 had around 43,000 subjects and in that population there was about a 95% reduction in cases vs placebo. Over time, it is clearer that the effectiveness with respect to the all-cases end-point is less. But that appears to be less a function of lying and more a function of the incremental way in which biomedical science asymptotically approaches the truth through iterative study and better understanding of confounding variables etc.