The Black Plague
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The picture shown to the left displays that the Black Plague was spread to humans by rats. The virus was held by fleas which easily infected these rats. Whoever came into contact with these infectous rats would most likely get the disease because it was so contagious.
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The map to the right represents when and where the Black Plague hit.
The Black Plague was given this name because it would create black boils/spots on the skin when a person was infected with it. When the Plague ended after five years (1347-1352), it had killed 25 million people. That is about one-third of Europe's entire population.