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The black death in Europe was caused by a virus which was carried by fleas. The fleas resided on the backs of black rats. The rats would help move the fleas, thus helping to mâ¦ove the virus. The fleas would bite people, which resulted in the people becoming infected.
The Black Death is thought to have originated in the arid plains of Central Asia, where it then travelled along the Silk Road, reaching Crimea by 1343. From there, it was most likely carried by Oriental rat fleas living on the black rats that were regular passengers on merchant ships. Spreading throughout the Mediterranean and Europe, the Black Death is estimated to have killed 30â60% of Europe's total population. In total, the plague reduced the world population from an estimated 450 million down to 350â375 million in the 14th century.