Ever since the FDA stopped making doctors seek approval to perform fecal transplants on Clostridium difficile patients (C. difficile) in early 2013, the procedure has become more widely accepted. The method, which involves introducing fecal matter from a healthy donor into the gut of an unhealthy donor, has a 90 percent success rate, so its increasing popularity should come as no surprise. Fortunately, a group of researchers at the Massachusetts General Hospital have given it the old clinical study try. C. difficile is a serious infection that kills 14,000 people in the US each year.