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If you are referring to the pandemic of 1347 an the following years the even is called the Black Death or the Black Plague, or simply The Plague.

If you are asking what disease caused the plague the most common theory is that it was some form of the Y. Pestis bacteria, the bacteria that causes Bubonic Plague in current times. This is not an extinct disease and cases still occur today. There is a vaccination available for at risk individuals who are traveling to areas of potential infection. Without medical treatment bubonic plague kills two out of three infected, but with modern medications and supportive care it is survivable. Of course, none of these were available in the 14th century.

This theory is not universally agreed upon. Alternate theories include anthrax, an unknown hemorrhagic disease similar to Ebola, or a combination of diseases such as typhus, small pox, and other infections. None of these theories has gained a dominant status, and the Y. Pestis theory continues to be the leading explanation.

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13y ago

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