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the claim

Microbiota can potentially affect vaccination effectiveness by modulating the host immune response.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
5 sources for · 0 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 Microbiota can potentially affect vaccination effectiveness by modulating the host immune response?

Yes. Multiple studies and reviews demonstrate that the gut microbiota can significantly modulate host immune responses, thereby affecting the efficacy and durability of various vaccines.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked

The analysis

The retrieved literature consistently supports the claim that the microbiota modulates host immune responses and vaccine effectiveness, citing mechanisms such as microbial metabolites, pattern-recognition receptors, and the impacts of dysbiosis or antibiotic exposure on antibody titers.

Evidence for · 5
The Gut Microbiome and Vaccination: A Comprehensive Review of Current Evidence and Future Perspectives.
2025
Reviews evidence showing that gut microbiota composition can influence both the magnitude and durability of vaccine-induced immunity.
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G, G. & M, E. (2025). The Gut Microbiome and Vaccination: A Comprehensive Review of Current Evidence and Future Perspectives.. doi.org. https://doi.org/10.3390/vaccines13111116

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More for · 4
Insights into Microbiota-Vaccine Crosstalk in Humans: Mechanisms, Modulators, and Translational Horizons.
2026
Discusses how the human microbiota modulates immune responses to vaccination through pathways such as pattern-recognition receptor signaling and microbial metabolites.
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AR, S., SP, M., S, L., S, P., P, M., CL, P., G, D., & C, S. (2026). Insights into Microbiota-Vaccine Crosstalk in Humans: Mechanisms, Modulators, and Translational Horizons.. doi.org. https://doi.org/10.3390/vaccines14090791

Investigating the role of baseline gut Akkermansia muciniphila and its co-metabolite palmitoleic acid in BCG vaccine efficacy: a preclinical study.
2026
Demonstrates in a preclinical study that pre-vaccination gut microbiota composition significantly affects vaccine efficacy and protection outcomes.
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D, C., L, C., C, C., Y, Y., X, W., D, C., P, Y., X, L., Y, Z., J, L., JF, X., J, P., G, Z., Y, L., & Z, G. (2026). Investigating the role of baseline gut Akkermansia muciniphila and its co-metabolite palmitoleic acid in BCG vaccine efficacy: a preclinical study.. doi.org. https://doi.org/10.1016/j.ebiom.2026.106404

Immunosenescence and Vaccine Efficacy in Aging: Dynamic Interplay of Gut Microbiota and mTOR Signaling Pathways.
2026
Highlights how aging-related disruptions in the gut microbiota-mTOR-immune axis impair vaccine efficacy and antibody production.
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J, L., Y, Z., D, Y., J, L., K, C., & L, C. (2026). Immunosenescence and Vaccine Efficacy in Aging: Dynamic Interplay of Gut Microbiota and mTOR Signaling Pathways.. doi.org. https://doi.org/10.1111/acel.70548

Impact of Early-Life Antibiotic Exposure on Gut Microbiome and Vaccine Immunogenicity in Infants: A Narrative Review.
2026
Indicates that early-life antibiotic exposure disrupts the gut microbiome and leads to significantly lower antibody titers following routine vaccinations.
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K, B., Z, B., M, S., B, B., & B, K. (2026). Impact of Early-Life Antibiotic Exposure on Gut Microbiome and Vaccine Immunogenicity in Infants: A Narrative Review.. doi.org. https://doi.org/10.3390/jcm15114161

What does the evidence say?

The retrieved literature consistently supports the claim that the microbiota modulates host immune responses and vaccine effectiveness, citing mechanisms such as microbial metabolites, pattern-recognition receptors, and the impacts of dysbiosis or antibiotic exposure on antibody titers.

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