https://www.sciencealert.com/new-evidence-links-the-collapse-of-the-aztec-society-to-a-deadly-salmonella-outbreak
When Spanish forces arrived in Mexico in 1519, the native population was estimated to be around 25 million. A century later, there were only around 1 million left, following several devastating outbreaks of disease brought in from overseas.
sciencealert.com
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