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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.
Beginning in 1347 and continuing for a full five years, a devastating plague swept Europe, leaving in its wake more than twenty million people dead. This epidemic now known as the Black Death was an outbreak of bubonic plague which had begun somewhere in the heart of Asia and spread westward along trade routes.he reason for this was that the bacillus depends on fleas carried by rats as its principal vector and the crush and filth of urban life aided greatly in the spread of bubonic plague, but that was not yet known. The result was that people fled the cities of Europe in large numbers.