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Table 2 Isolation of bacteria from patients admitted with severe community acquired pneumonia (n = 189)

From: Etiology and outcome of severe community acquired pneumonia in immunocompetent adults

Etiological agent No. of patients with positive cultures No. of patients who died
Staphylococcus aureus (7 from blood culture, 5 from tracheal aspirate, 1 from BAL, 2 from sputum) 15 8 (53)
Streptococcus pneumonia (11 from blood culture, 1 from tracheal aspirate, 2 from sputum) 14 4 (29)
Pseudomonas aeruginosa (3 from blood culture, 3 from tracheal aspirate, 2 from BAL, 1 from sputum) 9 8 (89)
Klebsiella pneumonia (5 from tracheal aspirate, 1 from BAL) 6 3 (50)
Mycobacterium tuberculosis (2 from BAL) 2 1 (50)
Moraxella catarrhalis (Tracheal aspirate) 1 1 (100)
Burkholderia pseudomallei (Tracheal aspirate) 1 1 (100)
Nocardia asteroids (Pleural fluid) 1 1 (100)
Streptococcus milleri (Pleural fluid) 1 0
Number of pathogens isolated 50 27 (54)
Number of patients with known etiology* 47 25 (53)
Number of patients with unknown etiology 142 71 (50)
  1. The values in the brackets are the percentages of patients who died with positive cultures.
  2. *Three patients had dual etiologies: Staphylococcus aureus and Pseudomonas aeruginosa in two and Pseudomonas aeruginosa and Nocardia asteroides in one patient.