Causes of<unk>  include: * Postoperative<unk>  * Pancreatitis * Necrosis of the bowel * Perforated ulcer * Diverticulitis * Appendicitis The microflora bacteria which commonly cause infection in<unk>  are microorganisms of low intrinsic virulence. These include Enterococcus, Candida, Staphylococcus epidermidis and Enterobacter.There is a difference in the organisms which cause secondary<unk>  compared to those that cause<unk>  and this can be referred to as a microbial shift. Some microfloral organisms have demonstrated multi-drug resistance highlighting the difficulty in treating the condition and so there is a poor prognosis. The composition of the microflora organisms usually depends on the location of the cause of the<unk> . Risk factors * Age: >70 * APACHE II Score (scores over 20) * Immunocompromised patient * chronic condition * female sex * previous<unk>  * existing organ failure measured by Goris score * fungal infections * malnutrition * organisms resistant to antimicrobial therapy * repeated surgical procedures
Tertiary peritonitis
Spontaneous bacterial peritonitis
Culture-bound syndrome
Abdominal compartment syndrome
Feline infectious peritonitis
Hemolytic–uremic syndrome
Proteus syndrome
Postcholecystectomy syndrome