>>91Toothpaste should have a negligible effect... I certainly do not swallow any noticeable amount when I brush. I think antacids like Tums, and milk of magnesia will have a far more dramatic effect. By the same token, adequate amounts of NaOH will also counteract the virus, I think.
I don't see how you can catch any of those diseases from consuming one's
own feces. Non zero presence of those bacteria usually implies active infection, and hence already have the disease. Natural coliform bacteria like e coli certainly can cause illness in a different section of the digestive tract.
I last recall from an immunology class I just took that certain worms shed their eggs in the feces. These worms only hatch when they reenter the intestines or something. Thus, it's possible that consuming one's own feces would contribute to an increased worm population, but it doesn't create a new infection/disease.