Gut bacteria linked to cataclysmic epidemic that wiped out sixteenth-century Mexico
Enlarge / Entrance of Hernan Cortes into Mexico In the wake of the Spanish conquest of the Aztec Empire in 1521, waves of epidemics slammed Mexico. By 1576, the population, which had been more than 20 million before the Spanish arrived, had crashed to two million. One brutal outbreak in 1545 was estimated to have…

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