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started in china
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when you got the plague you got boils filled with bacteria
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bacteria infected fleas and the fleas rode on the rats and bit humans and got them infected
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the mongals that layed siege on caffa got the plague and so many of them started to die they would lose so they started to catapult the infected parts of the person over the wall and it spread across the city and spread across the rest of europe
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ended on the other side of europe
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the black death ends and 25,000,000 died total
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30% to 70% DEAD!!!!!!
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the plague stopped spreading because it burned itself out