Are you? If so...
It's in the signature and contract when you agree to become a part of that medical study. You cannot disclose experimental outcomes, only they can (pick and choose). Done all the time my friend, and was the basis for my sister's thesis for obtaining a Masters then PhD up in Canada (where the media isn't so bought out). It's a monopoly with import restrictions all over the place. We only get a glimpse of it when you hear about lung cancer or opioids. Ironically, I had to find a reference out of the UK (that probably wouldn't still be in business in the US).
How to fool the public with a clinical trial that can’t fail | Spectator Life
As a result, the probability is quite high that we will see a vaccine come to market (amazingly fast) with any potential negative results sealed up tight, especially so in this political climate. Trump is afterall continuing to fire more watchdogs that might investigate wrongdoing (as in just this week).
So if a company does create such a cure ($$$), what we will not hear publicly, for years, are the side effects. And for most, that might be good enough, unless of course we end up with something useless like some of the test kits out there.
But I just happened to believe in one more problem than most, and that's that we're messing with the very evolution process that keeps us alive and adapting in parallel with nature. And nature is changing extremely fast thanks in part to humans, but also nature itself. Variations in our DNA by cosmic rays to some randomly created virus is a key part of balance.