Table S3 here[1] starting on page 9 appears to show nearly 80 different genuses within stool samples after filtering out "vegetative (non–spore form) bacteria, fungi, parasites, and viruses" [2].
No word on how many strains per genus, but reasonable to assume multiple, if not hundreds in some cases.
On nice! I will save that one and read up on each species. I think it would be useful to know which of those are beneficial and are missing from the 20 I utilize.
[1] https://www.nejm.org/doi/suppl/10.1056/NEJMoa2106516/suppl_f... [2] https://www.nejm.org/doi/full/10.1056/NEJMoa2106516