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Table 1 Pathogens detected and methods used for diagnosis in 700 adults with community-acquired pneumonia

From: Etiology of community-acquired pneumonia in a population-based study: Link between etiology and patients characteristics, process-of-care, clinical evolution and outcomes

Pathogens   Diagnostic method performed*
  Inpatients (N = 276) Outpatients (N = 424) Urinary Antigen (N = 678) Sputum (N = 222 ) Blood Culture (N = 221 ) Serologic Test (N = 663 )
Any pathogen identified 196 (71) 194 (45.7)     
Conventional bacteria 136 (69.4) 43 (22.2)     
Streptococcus pneumoniae 127 (64.8) 43 (22.2) 155 (22.9) 8 (3.6) 24 (10.9)  
Others bacteria 9 (4.6) 0 (0)   4 (1.8) 5 (2.3)  
Atypical pathogen 60 (30.6) 130 (67)     
Coxiella burnetii 15 (7.7) 57 (29.4)     72 (10.9)
Mycoplasma pneumoniae 22 (11.2) 40 (20.6)     62 (9.4)
Chlamydia pneumoniae 11 (5.6) 26 (13.4)     37 (5.6)
Chlamydia psittaci 1 (0.5) 1 (0.5)     2 (0.3)
Legionella pneumophila 11 (5.6) 6 (3.1) 17 (3.5)    
Virus 21 (10.7) 35 (18)     
Influenza virus 6 (3.1) 18 (9.3)     24 (3.6)
Parainfluenza virus 15 (7.7) 17 (8.8)     32 (4.8)
Total, mixed infection 21 (10.7) 14 (7.2)     
  1. Data are presented as numbers (percentage) unless otherwise stated. Values for mixed infections are included in those for each of the infecting organism.
  2. Others bacteria included Escherichia coli 4 cases, Stafhylococcus aureus 2 cases, Enterococcus faecalis 1 case, Pseudomonas aeruginosa 1 case, Morganella morganii 1 case.
  3. *Data are presented as numbers of patients with positive results. % = positive results/number of test performed
  4. P value <0.05, between inpatients and outpatients.