[1] Charles Univ Prague, Fac Med 2, Dept Med Microbiol, Prague, Czech Republic
[2] Motol Univ Hosp, Prague, Czech Republic
[3] Leeds Teaching Hosp NHS Trust, Leeds, W Yorkshire, England
[4] Univ Leeds, Leeds, W Yorkshire, England
[5] Leiden Univ, Med Ctr, Dept Med Microbiol, Leiden, Netherlands
[6] ESCMID, Study Grp Clostridium Difficile ESGCD, Basel, Switzerland