Two fascinating articles about current research on the Black Death–it shares same basic DNA with modern Bubonic plague, but there are intriguing differences–such as the lack of evidence that rats were the culprits leading to the possibility that it spread from human to human. Links below.

http://www.guardian.co.uk/world/2011/aug/17/black-death-rats-off-hook

and

http://www.nytimes.com/2011/08/30/science/30plague.html?_r=1

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