Table 4.
Comparison of the Frequency Distribution of Infectious Etiologies Between Pneumonic AECOPD and Nonpneumonic AECOPD Groups*
| Etiology | Pneumonic AECOPD (n = 23) | Nonpneumonic AECOPD (n = 217) | p Value |
|---|---|---|---|
| Viral agents | |||
| Influenza virus type A | 0 (0) | 23 (11) | NS |
| Influenza virus type B | 3 (13) | 12 (6) | NS |
| Parainfluenza virus type 1 | 3 (13) | 16 (7) | NS |
| Parainfluenza virus type 2 | 9 (39) | 29 (13) | 0.004 |
| Parainfluenza virus type 3 | 1 (4) | 6 (3) | NS |
| Adenovirus | 5 (22) | 15 (7) | 0.03 |
| Respiratory syncytial virus | 2 (9) | 14 (7) | NS |
| At least one of the above | 18 (78) | 99 (46) | 0.003 |
| Bacterial agents | |||
| S pneumoniae | 10 (43) | 38 (18) | 0.006 |
| H influenzae | 3 (13) | 7 (3) | NS |
| M catarrhalis | 1 (4) | 8 (4) | NS |
| At least one of the above | 10 (43) | 48 (22) | 0.02 |
| Atypical bacterial agents | |||
| Legionella spp. | 5 (22) | 35 (16) | NS |
| M pneumoniae | 3 (13) | 31 (14) | NS |
| At least one of the above | 8 (35) | 64 (30) | NS |
| Agent not identified | 1 (4) | 64 (30) | 0.001 |
*
Data are presented as No. (%).