Nosocomial > community onset diarrhea usually after taking antibiotic
Can occur in outbreaks.
Recurrence is very common therefore previous history of C. difficile is a risk factor. Antacids, especially proton-pump inhibitors, and chemotherapy also increase risk.
Wide range of symptoms possible, and 15% are asymptomatic
Profuse, watery diarrhea
Pseudomembranous colitis or toxic megacolon
Normal colonizer in infants: testing not recommended in < 2y age group
