Question

what is the history of black death?

Answer 1

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. Such an area is called a 'plague focus' or a 'plague reservoir'.
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Answer 2

The Black Death was an epidemic of bubonic plague, a disease caused by the bacterium Yersinia pestis that circulates among the wild rodents where they live in great numbers and density. Such an area is called the 'plague focus' or a 'plague reservoir'.