The usage of Antibiotics and a lack of homeostatic soil microorganisms in our soil is what causes bad bacteria to flourish in both small and large intestines. Soil microorganisms is what keeps bad bacteria, candida, etc....in check. They are mostly absent in our overfarmed, sprayed fields, but once were abundant. That's why IBS, colitis, diverticulitis, etc...are all very common now where they used to be almost non-existant.
Sorry, but I would recommend oregano oil before I would recommend Antibiotics . And....Primal Defense.