Table 2. CDI classification and symptom onset.

Disease classification	Symptom onset
HCF onset, HCF-associated CDI	>48 h after admission but before discharge from an HCF
Community-associated CDI	Community onset or within 48 h of HCF admission, if symptom onset was >12 weeks after last HCF discharge
Community onset, HCF-associated CDI	Community onset or within 48 h of HCF admission, if symptom onset was ≤4 weeks after last HCF discharge
Indeterminate CDI	Does not meet criteria for above disease classifications
Unknown CDI	Lack of available data; unable to classify

CDI, Clostridium difficile infection; HCF, healthcare facility. Adapted from refs. 5 and 24.