Clostridium difficile
C. diff infection can be treated with some antibiotic medicines.  However, C. diff is an antibiotic-resistant bacteria.  This means that many antibiotic medicines cannot kill C. diff.  This can make C. diff infection very difficult to treat.  Many people with C. diff infection have relapses (they get better for a while, but then get sick again).  This happens to about one in every five people with C. diff infection.