The plague was a highly lethal disease caused by a strain of bacteria called Yersinia pestis. The bacterium that the plague came from is usually confined to a type of flea and the rats that the flea feeds on. Different weather patterns were one of the causes of the plague bacteria to infect humans in the early 1300s. Environment conditions can cause the flea to infect humans with the bacteria, and spread suddenly over a large area (Jordan 90).

The Yersinia pestis flea usually occupied a certain kind of environment that is found in southern Asia, the Arabian Peninsula, and east Africa (Jordan 90). The fleas mostly fed on the ground-dwelling rodents of central Asia and the common black rat

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