DNA of 500-year-old bacteria is first direct evidence of an epidemic — one of humanity's deadliest — that occurred after Spanish conquest.
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Callaway, E. Collapse of Aztec society linked to catastrophic salmonella outbreak. Nature 542, 404 (2017). https://doi.org/10.1038/nature.2017.21485
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DOI: https://doi.org/10.1038/nature.2017.21485