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The plague bacterium occurs naturally in wild rats. During the 1320s the disease flared up in the Gobi desert of Mongolia. It gradually spread along trade routes, infecting much of Asia.

European merchants were trading with the East, buying spices and silks. It is likely that the plague moved with their trade caravans, travelling from Baghdad to trading stations in the Crimea. From there it rapidly spread across Europe.

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15y ago

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