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.

[1] https://www.nejm.org/doi/suppl/10.1056/NEJMoa2106516/suppl_f... [2] https://www.nejm.org/doi/full/10.1056/NEJMoa2106516