The Black Plague would have destroyed the human race
the doctors didnt do much though...
Yeah, European medieval medicinal practice was little more than sometimes avoiding dirt (if you could), surrounding yourself in pleasant smells, leeches, bloodletting and lots and lots of prayer.
Doctors weren't of use in Europe against the Black Death.
And the disease hasn't even been extinguished yet. It still exists across the globe, and has even been present in America.
It was reported in Madagascar last year.