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Abstract Liver cirrhosis, which is the final stage of chronic liver damage of various etiologies, results in major complications such as portal hypertension, variceal bleeding, ascites, spontaneous bacterial peritonitis, hepatic encephalopathy and hepatorenal syndrome. Spontaneous Bacterial Peritonitis is defined as an infection of the previously sterile ascitic fluid in absence of intraabdominal inflammatory focus. The pathogenesis of SBP thought to be due to intestinal bacterial overgrowth, the alterations (structural and functional) of the intestinal mucosal barrier and the deficiencies of the local immune response. Complement system is one of the major immune defense systems of the body. The proteins of the complement cascade have been found in peritoneal fluid, with lower levels in cirrhotic patients than in patients with ascites of other etiologies. The ascetic fluid Complement 3 is an important factor to offer local defense against infection of ascetic fluid. |