Follow up question. To keep one’s gut bacteria (assuming you didn’t have a c difficile infection etc but were doing very well with your microbiome) wouldn’t it be practical to just kinda… Poop a sample or two in the week before the surgery, freeze it, put it back at the end of the surgery? Assuming that washing/disinfecting will affect different kinds of bacteria differently and different growth rates and so on, it seems like a big gamble to assume that the right bacteria will grow back in the right ratio.