Clostridioides difficile (C. difficile) is a leading cause of illness and death, especially for frail and hospitalized Americans. Now, a new study suggests that the leading antibiotic used to fight it, vancomycin , may be losing potency against this killer. Advertisement "It's an alarming development in the field of C. diff , as there are only two recommended antibiotics," noted study co-author Dr. Kevin Garey , a professor of pharmacy practice and translational research at the University of