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Psoriasis

Compared within 2 studies that had both: 103 people with psoriasis and 40 healthy people. 11 microbes are less common in people with psoriasis, and none more common.

A difference is an association: it doesn’t mean these microbes cause, prevent or treat psoriasis.

Phylum

Searching opens both lists and shows only matching rows.

Less common in psoriasis · 11

Strongest first, then the biggest gap · Each figure is 10 people Strongest first · Each figure is 10 people
  1. Bacteroides ovatus in 2 studies Healthy 95% psoriasis 63%
  2. Butyricimonas virosa in 2 studies Healthy 47% psoriasis 15%
  3. Bifidobacterium animalis in 2 studies Healthy 36% psoriasis 7.8%
  4. Lachnospiraceae bacterium AM48-27BH in 2 studies Healthy 74% psoriasis 43%
  5. Alistipes senegalensis in 2 studies Healthy 36% psoriasis 11%

More common in psoriasis · 0

Strongest first, then the biggest gap · Each figure is 10 people Strongest first · Each figure is 10 people

None compared.

Where these numbers come from

Studies
Only GMrepo projects that had people with the condition and healthy people, 10 or more of each. Numbers come from those studies, never from pooling.Sampled in China, the United States.
How common
The share of people whose sample has any of it, in the people with the condition and in the healthy people of those same studies. Tested within studies (Cochran–Mantel–Haenszel, corrected for testing many microbes); a difference counts when it is clear and meaningful (Cohen’s h of 0.2 or more).
Strength word
Counted by code from how many studies point the same way: Seen again and again (3 or more, none clearly the other way), Seen more than once (2, the majority), Seen once (1, listed last). Where studies disagree, a row isn’t listed.
Each study
Tap a row for every study’s own numbers, and for how much carriers have.
Analysis
Our analysis of GMrepo data. GMrepo on Data sources · Read the rules

Also compared · 375 microbes

Compared within studies that had both, but not listed above.

Studies disagree · 4

No meaningful difference · 371
PubMed · human studies and reviews first

Recent research

All research on it
  1. Systematic review Experimental dermatology · 2026
    The Emerging Role of Gut Microbiota in Inflammatory Skin Diseases: A Systematic Review.
    PubMed ↗
  2. Observational Actas dermo-sifiliograficas · 2025
    Relation Between Gut Microbiome and Inflammatory Interleukins in Psoriasis Patients Compared to Healthy Controls: An Observational Study.
    PubMed ↗
  3. Review Inflammopharmacology · 2025
    Unravelling the gut-skin axis: the role of gut microbiota in pathogenesis and management of psoriasis.
    PubMed ↗
  4. Observational Microbiology spectrum · 2024
    Eubacterium rectale is a potential marker of altered gut microbiota in psoriasis and psoriatic arthritis.
    PubMed ↗
  5. Observational Letters in applied microbiology · 2021
    The gut microbiota profile in psoriasis: a Brazilian case-control study.
    PubMed ↗

Source: PubMed, U.S. National Library of Medicine · 25 linked papers, last 10 years