*Septic peritonitis caused by various agents, often [[Escherichia coli|''Escherichia coli'']] and anaerobic bacteria through perforation of the gut, rupture of [[Urinary Bladder - Anatomy & Physiology|urinary bladder]] or an abscess | *Septic peritonitis caused by various agents, often [[Escherichia coli|''Escherichia coli'']] and anaerobic bacteria through perforation of the gut, rupture of [[Urinary Bladder - Anatomy & Physiology|urinary bladder]] or an abscess |