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
Susanna Gregory's "Chronicles of Matthew Bartholomew", a Cambridge professor of medicine in the 1360s, provides great research into medical techniques of that era. Great mysteries, too..
Sorry, but Ignaz Semmelweis was not Jewish.
While he was a genius, he was also an asshole and created unnecessary resistance to his approach as a result.
Much the same was true of Galileo, BTW. Newton was also a 1st class asshole, but came out on top anyway.