Biology
Pie Chart of the Human Gut Microbiome by Phylum
Last reviewed on 2026-05-22.
Biology — verifiable data, editable template
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The human gut hosts roughly 38 trillion microbes — comparable to the number of human cells in the body. Two bacterial phyla, Firmicutes and Bacteroidetes, dominate.
The data
- Firmicutes — 55 %
- Bacteroidetes — 25 %
- Actinobacteria — 8 %
- Proteobacteria — 5 %
- Verrucomicrobia — 4 %
- Other — 3 %
Source
Human Microbiome Project (NIH).
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