DNA Detective Work Identifies Black Death Culprit

Hendrik Poinar, evolutionary geneticist, department of anthropology, Michael DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Canada

Michael McCormick, chair, science of the human past program, Goelet Professor of Medieval History, Harvard University, Cambridge, Mass.

Reporting in Proceedings of the National Academy of Sciences, researchers write that a strain of the bacterium Yersinia pestis was indeed the culprit behind the Black Death, a point long debated by scientists and historians. Ira Flatow and guests discuss the Plague's history, and its cause.

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