What was the cause of the Black death and how many people did it kill?

What was the cause of the Black death and how many people did it kill?
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The Black Death was believed to have been caused by the plague. Because it caused by infection with the bacterium Yersinia pestis, which is a facultative anaerobic organism that can infect humans by a rat flea. Scientists believe that the Black Death caused an estimation of 75-200 million deaths.
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