Table 2 Microbial etiology by age group in 700 adults with community-acquired pneumonia
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 |