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 |
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.
Others bacteria included Escherichia coli 4 cases, Stafhylococcus aureus 2 cases, Enterococcus faecalis 1 case, Pseudomonas aeruginosa 1 case, Morganella morganii 1 case.
* The p-value obtained from the chi-square or Fisher exact test.