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Table 2 Bacterial pathogens isolated from ETA

From: The utility of endotracheal aspirate bacteriology in identifying mechanically ventilated patients at risk for ventilator associated pneumonia: a single-center prospective observational study

Bacterial species n % of all subjects (n = 240) % of subjects carrying pathogen in ETA (n = 125)
Staphylococcus aureus 71 29.6 56.8
 MRSA* 29 12.1 23.2
 MSSA* 43 17.9 34.4
Klebsiella pneumoniae 17 7.1 13.6
Pseudomonas aeruginosa 14 5.8 11.2
Escherichia coli 13 5.4 10.4
Haemophilus influenzae 9 3.8 7.2
Enterobacter cloacae 7 2.9 5.6
Enterobacter aerogenes 6 2.5 4.8
Stenotrophomonas maltophilia 6 2.5 4.8
Serratia marcescens 5 2.1 4.0
Klebsiella oxytoca 4 1.7 3.2
Diphtheroid 4 1.7 3.2
Burkholderia cepacia 3 1.3 2.4
Moraxella spp. 3 1.3 2.4
Achromobacter xylosoxidans 2 0.8 1.6
Streptococcus pneumoniae 2 0.8 1.6
Acinetobacter baumannii 2 0.8 1.6
β-hemolytic Group F Streptococci 2 0.8 1.6
Proteus mirabilis 2 0.8 1.6
Serratia rubidaea 1 0.4 0.8
Acinetobacter lwoffii 1 0.4 0.8
Alcaligenes denitrificans 1 0.4 0.8
Streptococcus agalactiae 1 0.4 0.8
β-hemolytic Group C Streptococci 1 0.4 0.8
Citrobacter freundii 1 0.4 0.8
  1. *Two subjects carried both MRSA and MSSA simultaneously. One of the 71 patients with S. aureus positive ETA excluded as the isolate was not tested for antibiotic susceptibility