Involves source organ only without anatomical disruption.

Acquired outside of healthcare setting with no recent healthcare exposure.

Acquired more than 48 hours post admission, or hospitalization, surgery, dialysis, residence in long term facility within last 12 months.

Can be EARLY (less than 5 days) or LATE (more than 5 days) onset.

Septic shock. If patient has tertiary peritonitis and septic shock, please refer to postoperative IAI section.