Transmission of the plague
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The Black Plague started in Central Asia following changes to the land and climate
The bacterium Yersinia pestis carried by fleas on rats carried the plague
Mongol armies travelling throughout Asia, down the Silk Road to Crimea spread the disease further.
Germ warfare spread the disease to Italian merchants in Kaffa as bodies flew over the parapets
The merchants escaped to Sicily in 1347 carrying rats on their boats spreading the disease to Europe
The Black Plague was the world's worst pandemic reducing the world's population from ~450 to ~350 million in 100 years.
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