Today all or many COVID-19 drug were down. My wild guess, or analogy, would be that after last night's Trump's comment on the drug, "You go to the hospital and take the shot". Shorts are now actively shorting anything that doesn't fall in this category.

As a side effect, the drug that fall into this category have slided a bit.
That shorts now have to short all inferior COVID drugs. That's were the money is, now that Trump knows the answer.

There were my thoughts.
Any thoughts are welcome.