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Table 2 Microbial etiology by age group 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 Age group  
  18–44 years (N = 205) 45–64 years (N = 181) 65–74 years (N = 120) >74 years (N = 194) P value*
Any pathogen identified 121 (59) 80 (44.2) 67 (55.8) 122 (62.9) 0.0021
Conventional bacteria 28 (23.1) 31 (38.8) 33 (49.3) 87 (71.3) <0.0001
Streptococcus pneumoniae 27 (22.3) 31 (38.8) 32 (47.8) 80 (65.6) <0.0001
Others bacteria 1 (0.8) 0 (0) 1 (1.5) 7 (5.7) 0.03
Atypical agents 97 (80.2) 46 (56.3) 18 (26.9) 29 (23.8) <0.0001
Coxiella burnetii 46 (38) 15 (18.8) 4 (6) 7 (5.7) <0.0001
Mycoplasma pneumoniae 40 (33.1) 12 (15) 1 (1.5) 9 (7.4) <0.0001
Chlamydia pneumoniae 8 (6.6) 8 (10) 10 (14.9) 11 (9) 0.3
Chlamydia psittaci 0 (0) 1 (1.3) 0 (0) 1 (0.8) 0.8
Legionella pneumophila 3 (2.5) 10 (12.5) 3 (4.5) 1 (0.8) 0.001
Virus 8 (6.6) 6 (7.5) 22 (32.8) 20 (16.4) <0.0001
Influenza virus 5 (4.1) 4 (5) 7 (10.4) 8 (6.6) 0.4
Parainfluenza virus 3 (2.5) 2 (2.5) 15 (22.4) 12 (9.8) <0.0001
Total, mixed infection 12 (9.9) 3 (3.8) 6 (9) 14 (11.5) 0.3
  1. Data are presented as numbers (%) of patients, by age group. The rates of microorganism are related as the number of patients with any pathogen identified. 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. * The p-value obtained from the chi-square or Fisher exact test.