E coli is a normal commensal bacterium, part of your intestinal flora, we all have millions upon millions of them. The one synonymous with disease is a particular variant 157 which not all of us have.

You can only get MRSA or VRE from someone who has them, and then you are more likely to develop a carrier status than become dangerously ill. It is not possible by looking at someone to know what bugs have colonised their gut.

Yes, pathological organisms such as C. Difficile or Giardia, or Salmonella, Shigella or Campylobacter for that matter, can easily be caught by eating infected faeces and you never know who will be a carrier for these.

Like unprotected sex it's a compete lottery; I would find it difficult to recommend to someone.