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I believe I've heard of this being used for people who have the very difficult problem called C-Diff
"Clostridium difficile colitis results from disruption of normal healthy bacteria in the colon, often from antibiotics. C. difficile can also be transmitted from person to person by spores. It can cause severe damage to the colon and even be fatal.
Symptoms include diarrhea, belly pain, and fever.
Treatment includes antibiotics. Even when treated with antibiotics, the infection may come back. In rare cases, fecal transplant or surgery may be needed"