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I wish to know if there are any non-pathogenic (not even opportunistic pathogen) gram-positive bacteria in the human gut? Is there any reference that shows there exists a non-pathogenic gram-positive bacterium in the human gut?

I searched the internet but was unable to find anything conclusive.

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A recent Nature article, entitled A new genomic blueprint of the human gut microbiota, contains the following Figure:

Phylogeny of reference and uncultured human gut bacterial genomes

[Fig. 3 Phylogeny of reference and uncultured human gut bacterial genomes]

I don’t know much about bacteria, but, according to their entries in Wikipedia, Actinobacteria, and most Firmicutes are gram-positive and, as these appear to be present in abundance in the human gut of healthy individuals, one assumes that they are not pathogenic to humans.

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Link to wiki: https://en.m.wikipedia.org/wiki/Gut_flora

Found this under Composition -> Intestines: The small intestine contains a trace amount of microorganisms due to the proximity and influence of the stomach. Gram-positive cocci and rod-shaped bacteria are the predominant microorganisms found in the small intestine.

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