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the claim

Pathogens are only found in diseased individuals and are never found in healthy individuals.

the verdict
REFUTED
the evidence says no
Recorded sources
0 sources for · 3 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that pathogens are only found in diseased individuals and are never found in healthy individuals?

No. Pathogens are not restricted exclusively to diseased individuals; scientific evidence demonstrates that they can also be found in healthy people as asymptomatic carriers or part of normal microbiomes.

Verdict: REFUTED · 0 sources for, 3 against · Last checked

How claims like this are judged

Judged against fact-checker rulings and reference works: claims of this kind are settled by the fact-checking record, not journal abstracts.

Evidence against · 3
Wikipedia: Koch's postulates
Reference article covering this claim directly
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Wikipedia: Koch's postulates. (n.d.). Wikipedia. https://en.wikipedia.org/wiki/Koch%27s_postulates

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More against · 2
PLOS (all journals): Airway microbiome composition correlates with lung function and arterial stiffness in an age-dependent manner
Notes that healthy individuals also harbor transient microorganisms and low density lung microbiomes.
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PLOS (all journals): Airway microbiome composition correlates with lung function and arterial stiffness in an age-dependent manner. (n.d.). PLOS (all journals). https://doi.org/10.1371/journal.pone.0225636

Semantic Scholar peS2o: Blastocystis sp. in splenic cysts: causative agent or accidental association? A unique case report
States that the pathogen Blastocystis sp. is commonly found in apparently healthy and asymptomatic individuals.
Get citation
Semantic Scholar peS2o: Blastocystis sp. in splenic cysts: causative agent or accidental association? A unique case report. (n.d.). Semantic Scholar peS2o. https://parasitesandvectors.biomedcentral.com/track/pdf/10.1186/1756-3305-7-207

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