Yogurt is great and is helpful with general gut health but if it can replace beneficial coloform bacteria in your gut, they have some QA problems at the plant.
The fecal transplant carries bugs such as E. coli, essential to gut health but forbidden in food and drink by regulation.
The gut contains some 300-1000 different types of bacteria, but only 30-40 of these predominate, that is, take up most of the physical space. And a lack of physical space is key to keeping down the already present harmful and antibiotic resistant bacteria.
E. coli is one of this group of 30-40, but it has many subtypes, some of which are beneficial or neutral, and some of which are toxic or harmful. So it is not a particularly good probiotic. If there is a problem with other flora, an excess of E. coli leans toward the harmful side of the equation.
But that still leaves some 29-39 other types of bacteria, a large number of which are both commonly found in food and are generally regarded as safe, such as lactobacillus acidophalus, which are commonly added to milk products to make them probiotic.
Again, here is the list of those bacteria and yeasts typically found in Kefir.
http://www.culturesforhealth.com/milk-kefir-grains-composition-bacteria-yeast
Since these are generally regarded as safe, and some are beneficial, this is a good way to replenish the physical space in the GI tract which may have an insufficient number of helpful bacteria to keep out the bad bacteria.
E. coli is ubiquitous, so it can take care of itself.