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Which disease is known as ‘Black death’?

Which disease is known as ‘Black death’?
The Black Death, also known as the Pestilence and the Plague, was the most fatal pandemic recorded in human history, resulting in the deaths of up to 75–200 million people in Eurasia and North Africa, peaking in Europe from 1347 to 1351. Plague, the disease caused by the bacterium Yersinia pestis, was the cause; Y. pestis infection most commonly results in bubonic plague, but can cause septicaemic or pneumonic plagues.

The Black Death was the second plague pandemic recorded, after the Plague of Justinian (542–546). The plague created religious, social, and economic upheavals, with profound effects on the course of European history.

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'.