Short answer
In careful usage, microbiota are the microbes living in a place, while microbiome is the microbial community considered as a system in that place. CDC explicitly calls microbiota the microbes living in a microbiome. Researchers and public-facing sources sometimes use microbiome almost as a synonym for the collection of microbes, so context matters. 1 2
Microbiota identifies the organisms; microbiome commonly names the community in context, and the two words often overlap in actual usage.
On this page
At a glance
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| Question | Microbiome | Microbiota |
|---|---|---|
| Focus | Community in a defined habitat | Microbial members of that community |
| Typical phrase | Gut microbiome | Gut microbiota |
| Can the terms overlap? | Yes | Yes |
The table summarizes the cited definitions and the article’s stated scope. 1 2
What each thing is
Microbiome. A community of microorganisms in a defined habitat, often discussed together with its environment and collective genetic material. 1
Microbiota. The microorganisms living in a particular habitat, such as the human gut or skin. 1
Key differences
Microbiota answers “which organisms live there?” Microbiome usually frames those organisms as a community and can include their genes or surroundings in some technical definitions. A source may define its own preferred boundary, so read its definition before comparing results. 1 2
How to tell them apart
When reading a research claim, see whether the measurement is of organisms, their genes, or environmental interactions. A list of bacterial species is a description of microbiota; discussion of the whole gut ecosystem often uses microbiome. 1 2
Where they overlap
Both terms concern microbes in a particular place. The same sample can be described under either term, and ordinary health writing often swaps the words without intending a technical distinction. 1 2
Edge cases
There is no single universally enforced boundary. CDC uses “microbiome” for a community in a space, while other definitions explicitly include genetic material or environmental conditions. This page presents a useful reading rule, not a universal taxonomy. 1 2
Why the distinction exists
The paired terms help microbiologists distinguish community members from broader ecological context, even as popular usage simplifies both. 1 2
Common misconceptions
Microbiome is not another word for a single bacterium; microbiota is not automatically limited to bacteria, and neither word itself means a healthy community. 1 2
Examples
A survey reporting which bacteria and fungi live on skin describes skin microbiota. A study of those organisms interacting with one another and skin conditions discusses the skin microbiome. 1 2
Sources
Sources checked October 3, 2026.
- CDC — About Microbial Ecology. Terms to know.
- NIH NIGMS — What Is the Microbiome?. Opening definition.