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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.
Dr Sloane said the increased spread of Black Death over the winter of 1348 coincided with a seasonal decrease in the number of both rats and fleas, which are susceptible to cold. He also pointed out that rats are also killed by bubonic plague, but said there were no large deposits of rat bones from the 14th century.