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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.