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Alzheimer's disease

Compared within 4 studies that had both: 179 people with Alzheimer's and 163 healthy people. 1 genus is less common in people with Alzheimer's, and none more common.

A difference is an association: it doesn’t mean these genera cause, prevent or treat Alzheimer's. GMrepo reports this group at the genus level only, so these are genera, not species.

Searching opens both lists and shows only matching rows.

Less common in Alzheimer's · 1

Strongest first, then the biggest gap · Each figure is 10 people Strongest first · Each figure is 10 people
  1. Roseburia genus in 4 studies Healthy 48% Alzheimer's 37%

More common in Alzheimer's · 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 Canada, Germany, Turkey, 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 · 122 genera

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

Studies disagree · 1

No meaningful difference · 121
PubMed · human studies and reviews first

Recent research

All research on it
  1. Observational Clinical oral investigations · 2026
    Novel salivary biomarkers of Alzheimer's disease identified by integrated metabolomics and microbiomics analysis.
    PubMed ↗
  2. Review Biomolecules · 2026
    Akkermansia muciniphila and Alzheimer's Disease: Mechanisms, Evidence and Translational Potential.
    PubMed ↗
  3. Systematic review Molecular neurobiology · 2026
    Gut Microbiota Dysbiosis and Neuroinflammation in Alzheimer's Disease: a Systematic Review of Mechanistic Insights.
    PubMed ↗
  4. Observational Journal of Alzheimer's disease · 2026
    Association of yoga with cognitive and gut microbiome changes in Alzheimer's disease: An exploratory case-control study.
    PubMed ↗
  5. Observational Nutrients · 2026
    MIND Pattern Nutritional Intervention Modulates Mediterranean Diet Adherence and Gut Microbiota in Alzheimer's Disease: An Observational Case-Control Study.
    PubMed ↗

Source: PubMed, U.S. National Library of Medicine · 94 linked papers, last 10 years