The only people to have much luck in avoiding the Black Plague in Europe were:

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Pope Clemens VI used fire as a form of air purification, a common belief at the time for warding off the plague. Wealthy individuals often fled to the countryside, where lower population densities reduced their risk of infection. Jews were mistakenly thought to be spared by the plague, leading to widespread persecution, but in reality, they suffered from the plague as well. Thus, all of these choices reflect groups believed to have had better chances of avoiding the Black Plague, whether through actions taken or misconceptions.

The Only People to Have Much Luck in Avoiding the Black