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Plague arrives in Europe via Genoese Merchant ships either from the Middle East or the Crimea, especially Caffa, which disembarked at Messina in Sicily in October 1347.
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From Messina, the plague spread across Sicily and then moved Northward following the trade routes. Florence, Genoa and Pisa with populations before the plague of nearly 100,000 suffered losses of 50-60%
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By the end of 1348, the plague had crossed the Alps through trade and began infecting German states and England where one third of the population would die.
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Among those shouldering blame for the catastrophe were the Jews who were the objects of pogroms, especially in Germany.
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By December 1349, the plague was in Northern Germany.
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By June 1350 the plague had entered the Baltic region.
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The plague had run its course as it entered the cold climate of the Northern Blatic.