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Table 4 Microbial isolation from surveillance cultures in the three study groups

From: Biofilm formation on three different endotracheal tubes: a prospective clinical trial

  OPC OPC-ETT match ETA ETA-ETT match
Total number of different microorganisms isolated 150 (100) 51 (100) 133 (100) 51 (100)
Microorganism
Gram-positive bacteria
Enterococcus faecalis 15 (10) 4 (7.8) 10 (7.5) 4 (7.8)
Enterococcus faecium 13 (8.6) 2 (3.9) 5 (3.9) 1 (2.0)
Staphylococcus aureus 9 (6.0) 3 (5.9) 15 (11) 4 (7.8)
Staphylococcus epidermitis 2 (1.3) 1 (2.0) 2 (1.5)  
  Beta hemolytic streptococcus group A 1 (0.7)   1 (0.7)  
Streptococcus pneumoniae    1 (0.7)  
Gram-negative bacteria
Klebsiella species 9 (6.0) 1 (2.0) 4 (3.1) 2 (3.9)
Stenotrophomonas maltophilia 8 (5.2) 4 (7.8) 7 (5.3) 4 (7.8)
Pseudomonas aeruginosa 6 (4.0) 4 (7.8) 5 (3.9) 4 (7.8)
Haemophilus influenzae 4 (2.7)   5 (3.9)  
Enterobacter cloacae 2 (1.3)   2 (1.5)  
Serratia marcescens 3 (2.0) 1 (2.0) 1 (0.7) 1 (2.0)
Escherichia coli* 4 (2.7) 1 (2.0) 2 (1.5)  
Citrobacter freundii 2 (1.3) 1 (2.0) 1 (0.7) 1 (2.0)
Chryseobacterium indologenes 2 (1.3) 2 (3.9) 3 (2.3) 2 (3.9)
Acinetobacter sp. 1 (0.7)   1 (0.7)  
Other bacterial species 5 (3.4)   8 (6.2)  
Yeast
Candida species 60 (40) 27 (53) 52 (39) 27 (53)
Candida albicans 41 (27) 21 (41) 37 (28) 21 (41)
Candida dubliniensis 8 (5.3) 1 (2.0) 6 (4.5) 1 (2.0)
Candida parapsilosis 2 (1.3) 1 (2.0) 2 (1.5) 1 (2.0)
Candida tropicalis 2 (1.3) 1 (2.0) 2 (1.5) 1 (2.0)
   Other candida species 7 (4.7) 3 (5.9) 5 (3.9) 3 (5.9)
  Other yeasts, not candida 4 (2.7)   8 (6.0) 1 (2.0)
  1. Note: Data are presented as numbers (percentages). The percentage of positive cultures is related to how many patients were colonized with the specific microorganism. *Includes Escherichia coli producing extended-spectrum beta-lactamase (ESBL). Approximately 25% of oropharyngeal cultures and 18% of endotracheal cultures were polymicrobial. Abbreviations: OPC oropharyngeal culture, ETA endotracheal culture, ETT endotracheal tube