My husband had pneumonia last year and ended up in the hospital where they put him on antibiotics which caused him to have diarrhea.
Six weeks after this he was still having the diarrhea in spite of taking lots of probiotics so we did a FT at home (using a close friend with a history of only having a little bit of antibiotics once or twice in her life as a donor) and the next day there was a slight improvement and after a week he was back to normal.