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The black death, or Bubonic Plague, came from a bacterium now known as Pasteurella pestis. It was carried by fleas who, in turn, attached to rats on merchant ships coming from the East of Europe. These rats then transmitted the disease, which also was contagious to humans. All it took was for one human to get bitten by a rat or flea and he or she would have the bubonic plague.

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16y ago

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