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The bubonic plague was caused by fleas that lived on rats. Because in the middle ages the rats were running around everywhere they used to live in sewers, they then got fleas and
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There are a few things that caused the plague. The main thing that caused the plague was bubonic plague which was transmitted by the fleas on rats. The overlying cause was the unclean
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The Black Plague, otherwise known as the Bubonic Plague, was a disease that started in rats and mice, but it was transmitted to humans via fleas. You can find more information here:
http://answers.ask.com/Health/Diseases/what_caused...
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The black plague (or Black Death) was spread by a bacteria that lived on fleas. Those fleas in turn lived on the black rat. As the population of the rats spread, so did the disease.
http://answers.ask.com/Health/Diseases/what_caused...
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