Black Death had once concurred Europe and wiped more than 50% of its population. In times earlier than recognizing bacteria and viruses, but magic or religious fanaticism. However, it was a founding stone of modern Europe.
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The Black Death (1346–1353) was caused by the bacterium Yersinia pestis, which was transmitted to humans primarily by fleas carried on rodents. This bacterium caused a devastating, highly contagious pandemic that killed up to 50% of Europe's population through bubonic, pneumonic, and septicemic plagues.
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