The doctors in my clinical trial took 5 years to select 1 or 2 candidates from a pool of 2,000 volunteers. They screened their stool once a month for 3 years and followed their lifestyles closely. These people have always lived in the same place, never travelled, never had GI illness, never did antibiotics or vaccines, never had surgery, never spent time in high risk hospital zones, have perfect diets, etc. Once they obtained those 2, one person dropped out of the program for unknown reasons. Now they just have the 1 person.
Hi do you know the name of your clinical trial? I'd be interested to read more about