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the claim
Epidemic disease spread only from Europe to America and not both ways during the Columbian Exchange
the verdict
REFUTED
the evidence says no
confidence 18/100

The claim that epidemic diseases spread exclusively from Europe to the Americas during the Columbian Exchange is incorrect. Archaeological and genetic evidence indicates that certain endemic and epidemic pathogens, such as those causing treponemal infections, were already present in the Americas prior to Columbus's voyages.

Evidence against · 2
Redefining the treponemal history through pre-Columbian genomes from Brazil.
2024 · cited by 19
Genomic evidence from pre-Columbian human remains in the Americas demonstrates that treponemal pathogens (related to syphilis and other diseases) already existed in the Americas long before European contact.
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More against · 1
Ancient genomes reveal a deep history of Treponema pallidum in the Americas.
2025 · cited by 8
Ancient pathogen genome analysis supports the American origin of Treponema pallidum lineages, refuting the notion that epidemic disease spread exclusively from Europe to the Americas.
The paper trail · every fact has a biography
first checked01 Aug 2026
judged → REFUTED · 1801 Aug 2026
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