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An earthquake caused the bacteria to travel out of the waters and make their way to rats' bloodstream.
Rats along with fleas travel to Crimea from Central Asia.
People in Crimea outside of Caffa started dying.
In 1346, infected corpses are thrown by the Mongols over the walls of Caffa. The enclosed city started to get infected.
The merchants in Caffa fled , with rats and fleas in their ships. They tried to dock while through the Mediterranean Sea.
They get to Sicily where they infected local residents with the help rats and fleas. This results to a third of Europe's population getting wiped out.
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