Bacteria · Species

Prevotella copri

Contested A plant- and fibre-diet-associated species with a genuinely double-edged reputation — expanded in new-onset rheumatoid arthritis, yet a marker of healthy high-fibre diets elsewhere.

Associated with these conditions

Type 2 diabetes Mixed

Linked to worsened insulin resistance in some studies via branched-chain amino acids, yet beneficial on fibre-rich diets in others.

Disputed / mixed studies conflict

Autism spectrum (ASD) Reduced

Reduced Prevotella is one recurring finding, but the ASD microbiome literature is inconsistent and prone to overclaiming.

Preliminary studies conflict

Multiple sclerosis Reduced

Reduced Prevotella is one of the more reproducible MS shifts and rises again on treatment.

Moderate evidence

Parkinson’s disease Reduced

Reduced Prevotella is among the most reproducible Parkinson’s findings.

Moderate evidence

Rheumatoid arthritis Elevated

Markedly expanded in new-onset, untreated rheumatoid arthritis — one of the field’s stronger single-organism links.

Moderate evidence

New-onset untreated rheumatoid arthrits Elevated

Reported in HMDAD (1 cited study).

Moderate evidence

Colorectal cancer Associated with

Reported in Disbiome.

Preliminary

HIV infection Associated with

Reported in Disbiome.

Preliminary

Pervasive developmental disorder NOS Associated with

Reported in Disbiome.

Preliminary

Cardiovascular disease Associated with

Reported in Disbiome, Peryton.

Moderate evidence

Atrophic gastritis Associated with

Reported in Disbiome.

Preliminary

Neuromyelitis optica Associated with

Reported in Disbiome.

Preliminary

Primary sclerosing cholangitis Associated with

Reported in Disbiome.

Preliminary

Primary sclerosing cholangitis-IBD Associated with

Reported in Disbiome.

Preliminary

Obesity Associated with

Reported in Disbiome.

Preliminary

Graves' orbitopathy Associated with

Reported in Disbiome.

Preliminary

Gastric carcinoma Associated with

Reported in Disbiome.

Preliminary

Fibromyalgia Associated with

Reported in Disbiome.

Preliminary

Helicobacter pylori infection Associated with

Reported in Disbiome.

Preliminary

Acute cerbral infarction Associated with

Reported in Disbiome.

Preliminary

Psoriasis Associated with

Reported in Disbiome.

Preliminary

Spleen deficiency syndrome Associated with

Reported in Disbiome.

Preliminary

Kidney stone Associated with

Reported in Disbiome.

Preliminary

Non-alcoholic fatty liver disease Associated with

Reported in Disbiome.

Preliminary

Human end-stage renal disease Associated with

Reported in Disbiome.

Preliminary

Traumatic Brain Injury Associated with

Reported in Disbiome.

Preliminary

Oropharyngeal cancer Associated with

Reported in Disbiome.

Preliminary

Hypopharyngeal cancer Associated with

Reported in Disbiome.

Preliminary

Myasthenia gravis Associated with

Reported in Disbiome.

Preliminary

Sarcopenia Associated with

Reported in Disbiome.

Preliminary

Colorectal Neoplasms Associated with

Reported in Peryton.

Preliminary

Crohn Disease Associated with

Reported in Peryton.

Preliminary

Parkinson Disease Associated with

Reported in Peryton.

Preliminary

Tongue Neoplasms Associated with

Reported in Peryton.

Preliminary

Liver Neoplasms Associated with

Reported in Peryton.

Preliminary

Stomach Neoplasms Associated with

Reported in Peryton.

Preliminary

Irritable Bowel Syndrome Associated with

Reported in Peryton.

Preliminary

Celiac disease Associated with

Reported in Peryton.

Preliminary

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