The Magnitude and Duration of Clostridium difficile Infection Risk After Antibiotic Therapy, Sunnybrook Hospital, Toronto, Canada, June 2010 to May 2012.

Among inpatients, the incidence of Clostridium difficile infection was highest in the period 3 to 14 days after the start of antibiotic therapy, during antibiotic therapy, and within 5 days of the end of antibiotic therapy. * Includes patients without any identified antibiotic use.