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  • A flea infected with the Yersinia Pestis bacteria ( Plague Bacteria) bit a rat.
  • The Rats got friendly with the humans, the rats infected the Mongols. The Mongols got grumpy at the Italian merchants so they threw infected corpses over the wall into Caffa. 
  • Italian merchants sailed away. They had infected rats on board, but they didn't know.
  • They sailed back to Europe, and the rats climbed ashore. This caused the plague to break out in 1347.
  • People had rats already living in their houses. When the infected rats with infected fleas came into their house the fleas bit the humans and further spread the disease. 
  • 1/3 of the world's population died... The End :)
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