BiotaMD · the living gut
Condition

Irritable bowel syndrome (IBS)

3 associated organisms · Highly heterogeneous, so findings are less consistent than in IBD. This is where the contested parasites — Blastocystis and Dientamoeba — show up most, with genuinely mixed evidence.

Organisms associated with Irritable bowel syndrome (IBS)
Bifidobacterium Beneficial Reduced in Irritable bowel syndrome (IBS)
Genus

Commonly lower in IBS and a frequent probiotic target, though effect sizes vary widely.

Moderate evidence source: curated sample
Methanobrevibacter smithii Commensal Elevated in Irritable bowel syndrome (IBS)
Archaeon

This methane-producing archaeon is enriched in constipation-predominant IBS and linked to slower transit.

Moderate evidence source: curated sample
Blastocystis Contested Mixed in Irritable bowel syndrome (IBS)
Protozoan (protist)

The contested one: linked to IBS in some studies, yet associated with healthier, high-diversity guts in asymptomatic carriers. Many IBS patients don’t carry it at all.

Disputed / mixed studies conflict source: curated sample
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