CRP and bacterial infectious disease: Based on the symptoms of fever and abdominal pain, along with leukocytosis and a left shift in the differential count, elevated C-reactive protein(CRP) and procalcitonin as markers of infection, thickening of the peritoneum, and exudative ascites, a diagnosis of post-hepatitis cirrhosis complicated with spontaneous bacteria peritonitis was made and the patient received cefoperazone monotherapy for 48 hours followed by combined with vancomycin to fight against bacterial infection.