Really? They aren't sure why?.....
https://goo.gl/5f9SvfIn an analysis of a large, nationwide health insurance database, researcher's at the University of Pennsylvania's Perelman School of Medicine found that the annual incidence of multiple recurring Clostridium difficile (mrCDI) increased by almost 200% from 2001 to 2012. During the same period the incidence of ordinary CDI increased by only about 40%. The study results were published this week in the Annals of Internal Medicine.
The reasons for the sharp rise in mrCDI incidence is unknown. Researchers said the finding points to an increased burden on the healthcare system, including increased demand for new treatments for recurrent CDI. The most promising of these new treatments, fecal microbiota transplantation -- the infusion of beneficial intestinal bacteria into patients to compete with C. difficile -- has shown good results in small studies, but hasn't yet been thoroughly evaluated.
(It hasn't been thoroughly evaluated because pharma makes more money from expensive antibiotics than from fecal transplants.)