Judaism has a plethora of rules and commandments revolving around cleanliness. In following these rules, one would think that they minimized their chances of infection. Were they more likely to not catch the diseases of the Black Death than their non-Jewish peers? If that is the case, did significantly fewer Jews (by percentage of population, obviously not by raw number) die during the Black Death?
No. If anything, it was worse. They faced the disease as well as persecution from people who promulgated and believed the rumours that Jews were responsible for the plague. A few selections from primary sources are here. An essay on it is here.
hi! you may be interested in a couple of earlier discussions
How did the death rate among Jews compare to the rest of Europe during the plague years?
Did the increased amount of Jews in Poland lessen the severity of the black death in Poland?