This may at least partly explain the patchy results in FMT trials: not all poo is created equal. Science Alert article: There Are People Amongst Us Whose 'Super Poop' Can Treat Serious Diseases https://www.sciencealert.com/super-...splants-identified-as-phenomenon-in-new-study Frontiers review article: The Super-Donor Phenomenon in Fecal Microbiota Transplantation https://www.frontiersin.org/articles/10.3389/fcimb.2019.00002/full