You may not yet have heard of the bacterium Clostridium difficile (C. dif.), but in the next few years it will likely become a household name, as well known as Staph and Strep.  C. dif. causes a severe infection of the colon leading to severe diarrhea.  It frequently results as a consequence of antibiotic use.  Antibiotics can kill the normal intestinal bacteria and allow harmful bacteria like C. dif. to proliferate. Decades ago, C. dif....