It will not be a treatment that swings the market, but actual data.
The U.S. loses ~30,000 lives annually to influenza in the average year. (It's between 20k and 55K in recent years, with the mean closer to the bottom.) Over a five month flu season, that's nearly 200 souls lost per day. And nobody so much as gives a cough about it.
Today, CoVID-19 recorded its 200th death in the U.S., since January 1.
In that time, ~15,500 deaths from the flu.
Again, it won't be a treatment that swings the market, but common sense.