The fact is, we are surrounded by microbes.
Hundreds of species live naturally on our skin.
Many species get airborne all the time, and we breath them in, swallow them, get them in our eyes, nose, sinuses, ears, open sores, hair, everywhere!
Food we consume, unless hot, is loaded with microbes.
But ,for people who used Antibiotics , and artificial hormones (birth prevention, corticosteroids and other medications), normal day-to-day exposure may not be enough .... and some people become seriously sick.
Not everyone, just those who excede their natural tolerance, natural threshold to Antibiotics , hormones, medications, negative thoughts, stress, preservatives , sugar, industrial garbage, junk food, chlorine in water, polluted air, sterile environment, wrong lifestyle, addictions etc.
If you have symptoms of IBS, crohn's, colitis, acne, candida, seb-derm, allergies, eczema, celiac, food intolerance, psychiatric diseases, depression, indigestion etc...
seriously consider the possibility that a poop from a very healthy person may help you 1000 or 1 million times more than whatever else you are doing for your health.
Healthy poop is the most powerful medicine for the post- Antibiotic human.