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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.
Answers. The Black Death of 14th century Europe was caused by the spreading of the bacteria Yersinia Pestis on fleas carried by rats on trading ships from Asia. In Asia (where the plague had an even larger effect than it did in Europe), infected fleas would stay on rats, and the rats would board trading ships. These ships would land in European harbors, letting off the goods and the rats.