|Source: Serenity, Wikimedia|
Clostridium difficile takes advantage of a void in the intestinal flora to grow and cause illness. Long-term antibiotic therapy and exposure to health care settings are risk factors for infection with this bacteria. However, exposure to the pathogen is by fecal contamination - meaning that proper hygiene and sanitation practices can minimize, and often eliminate, risk of infection.
Read more on the causes of C. diff infection.