Spontaneous infection of the peritoneal cavity, usually associated with liver disease and ascites [spontaneous bacterial peritonitis (SBP)].

Infection of the peritoneal cavity due to spillage of organisms into the peritoneum, usually associated with GI or genitourinary tract (e.g., due to perforation, trauma, pelvic inflammatory disease).

Recurrent infection of the peritoneal cavity following an episode of secondary peritonitis.