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Clinical Manifestations and Therapeutic Implications of Peritonitis Abstract. Peritonitis is a heterogenous disease, commonly classified into three types. Primary peritonitis, defined by the absence of another directly related intraabdominal abnormality, can often be treated conservatively and is thus distinguished from secondary peritonitis, which results from an independent diagnosis like the perforation or necrosis of an intraabdominal organ and usually requires surgical therapy. The more recently defined tertiary peritonitis is a form of secondary peritonitis that relapses or persists after 48 hours of adequate therapy with no surgically removable focus. This article addresses three important clinical manifestations of peritonitis and their therapeutic implications: spontaneous bacterial peritonitis as the mayor manifestation of primary peritonitis; postoperative peritonitis as a severe subform of secondary peritonitis; and peritoneal dialysis-associated peritonitis as a distinctive clinical picture.