The Black Death

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A deadly outbreak occurred in china in the 1330's. The plague mostly infected rodents but was transmittable to humans from fleas. Plague causes pain full swelling of lymph nodes and a fever. The diesease also causes red bumps that eventually turn black. Did not disappear until the 1600's. http://www.themiddleages.net/plague.html
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The Black Death was an epidemic of bubonic plague, a disease caused by the bacterium Yersinia pestis that circulates among wild rodents where they live in great numbers and density. . Plague among humans arises when rodents in human habitation, normally black rats, become infected. The black rat, also called the house rat, and the ship rat, likes to live close to people, which is what makes it dangerous. http://www.historytoday.com/ole-j-benedictow/black-death-greatest-catastrophe-ever