An open-label clinical study in which all subjects will receive the same investigational drug, for people with recurrent Clostridium difficile infection (CDI), which is an infection in the intestines. This infection causes severe diarrhea. Recurrent Clostridium difficile (C. diff) infection is being studied as part of a medical research study for an investigational new drug called RBX2660, an enema made of a solution of stool (poop or feces).