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Collapse of Aztec society linked to catastrophic salmonella outbreak : Nature News & Comment

“In 1519, when forces led by Spanish conquistador Hernando Cort├ęs arrived in Mexico, the native population was estimated at about 25 million. A century later, after a Spanish victory and a series of epidemics, numbers had plunged to around 1 million.”

http://www.nature.com/news/collapse-of-aztec-society-linked-to-catastrophic-salmonella-outbreak-1.21485