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Table 4 Numbers and percentages of bacteria responsible for PP according to the use of broad-spectrum IA

From: Risk factors for multidrug resistant bacteria and optimization of empirical antibiotic therapy in postoperative peritonitis

Microorganisms Patients without broad-spectrum IA
(n = 65)
Patients with broad-spectrum IA
(n = 35)
Multidrug resistant bacteria, n(%) 24 (13) 41 (48) *
   Enterobacteriaceae, n(%) 9 (5) 16 (19) *
   Pseudomonas aeruginosa, n(%) 3 (2) 5 (6)
   Acinetobacter baumannii, n(%) 1 (1) 1 (1)
   Enterococci, n(%) 4 (2) 3 (3)
   Methicillin-resistant S. aureus, n(%) 4 (2) 3 (3)
   Methicillin-resistant CNS, n(%) 3 (2) 13 (15) *
Other bacteria, n(%) 160 (87) 44 (52)
   Enterobacteriaceae, n(%) 69 (37) 11 (13) *
   Pseudomonas aeruginosa, n(%) 2 (1) 6 (7)
   Enterococci, n(%) 31 (17) 12 (14)
   Streptococci, n(%) 27 (15) 5 (6)
   Staphylococci, n(%) 5 (3) 0
   Other pathogens, n(%) 26 (14) 10 (12)
Total number of bacteria 184 (100) 85 (100) *
  1. CNS, coagulase negative staphylococci; IA, interval antibiotic therapy; PP, postoperative peritonitis; * P < 0.05 vs group without broad-spectrum IA.