The basic medical knowledge we have in this day and age would serve one very well in an age where “bleeding” and astrological charts were the main medical tools..
Doctors who tried to advance the cause of simply washing hands between patients were singled out and ostracized.
Even when the science proved that washing hands before assisting in childbirth saved lives, the Jewish doctor who ‘invented’ it died a broken man.
It would be a lot tougher than we think