This has been known since the beginning of this plannedemic, just unreported by media.

For those wondering, it is right on the NIH

More sauce from

And from 4/30 MSM before they reworked the narrative.
Coronavirus Drug Exclusive: Meet The Doctor Behind The Hydroxychloroquine Treatment, And What’s Next For Its Use – CBS New

Even more sauce...
Turkey claims success treating COVID-19 with hydroxychloroquine, the drug touted by Trump - CBS