The great waves of plague that twice devastated Europe and changed the course of history had their origins in China, a team of medical geneticists reported Sunday, as did a third plague outbreak that struck less harmfully in the 19th century.

http://www.nytimes.com/2010/11/01/health/01plague.html?src=me&ref=general

http://www.nature.com/ng/journal/vaop/ncurrent/full/ng.705.html

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