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FMT transplants have a very high success rate for treating C Diff infections that don't respond to antibiotics. Something like 70-80% success.

The numbers I've seen are higher than that.

The Mayo Clinic has posted numbers for a couple of different clinic locations that have seen a a 90% success rate.

Source?

Fecal Transplantation for Recurrent Clostridium difficile Infection in Older Adults: A Review - https://onlinelibrary.wiley.com/doi/abs/10.1111/jgs.12378

Fecal Microbiota Transplantation for Clostridium difficile Infection: A Systematic Review - https://annals.org/aim/article-abstract/2288521/fecal-microb...

I just cribbed these from the Wikipedia article at https://en.wikipedia.org/wiki/Clostridioides_difficile_infec... so I don't know if there's better or more recent studies.

Here is a comparison of capsule-based FMT versus colonoscopy-based FMT, in which either approach had a (very) high success rate.