Genic B, Rupnik M, Gerding DN et al.: Distribution of Clostridium difficile variant toxinotypes and strains with binary toxin genes among colinical isolates in an American hospital. J Med Microbiol 53: 887-894, 2004.
Voth DE, Ballard JD: Clostridium diffcile toxins: Mechanism of action and role in disease. Clin Microbiol Rev 18: 247-263, 2005.