Taxonomy
Family: Clostridiaceae

Natural habitats
They inhabits the microflora of intestines of humans. Around 3% of healthy adults and up to 70% of babies have a number of C. difficile bacteria living in their gut.

However, the number of C. difficile bacteria is kept very low and in control by the millions of harmless bacteria in the intestines that aid in digestion.

Clinical significance
Is the major cause of antibiotic associated pseudomembranous colitis, is it also the most frequently identified cause of hospital acquired diarrhea.