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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.
A study of 133 New York City rats found 6,500 fleas, lice and mites that can carry bacteria that can cause serious diseases in humans, the study by Cornell and Columbia universities found. Among the creepy critters found were Oriental rat fleas, which are notorious for their role in spreading the bubonic plague, said lead author and Cornell entomologist Matthew Frye.