Preoperative:

One dose of cefoxitin or piperacillin/tazobactam

Postoperative:

 Non-perforated:

No further antibiotics

 Gangrenous:

Two additional doses of piperacillin/tazobactam, or ertapenem if allergic

 Perforated:

12-day total course of postoperative antibiotics: piperacillin/ tazobactam while an inpatient; amoxicillin/ clavulanate and metronidazole once discharged home

Percutaneously drained abscess:

14-day course of piperacillin/tazobactam; ertapenem if allergic. Drain is removed when output is <15 mL/24 h