Table 2. Pneumonia etiology by age category.
| Age Group N (%) | Total (N = 406)* | ||
|---|---|---|---|
| Viral Pathogens | < 1 year (n = 238) | 1 to 5 years (n = 168) | |
| Adenovirus | 35 (14.7%) | 27 (16.1%) | 62 (15.3%) |
| Influenza | 40 (9.9%) | ||
| Type A | 16 (6.7%) | 13 (7.7%) | 29 (7.1%) |
| Type B | 7 (2.9%) | 4 (2.4%) | 11 (2.7%) |
| Parainfluenza | 57 (14.0%) | ||
| Type 1 | 10 (4.2%) | 5 (3.0%) | 15 (3.7%) |
| Type 2 | 3 (1.3%) | 4 (2.4%) | 7 (1.7%) |
| Type 3 | 27 (11.3%) | 8 (4.8%) | 35 (8.6%) |
| Human metapneumovirus | 40 (16.8%) | 31 (18.5%) | 71 (17.5%) |
| Respiratory syncytial virus | 105 (44.1%) | 54 (32.1%) | 159 (39.2%) |
| Bacterial Pathogens | |||
| Streptococcus pneumoniae (n = 403) | 20 (8.5%) | 17 (10.1%) | 37 (9.2%) |
| Mycoplasma pneumoniae | 0 (0%) | 3 (1.8%) | 3 (0.74%) |
| **Haemophilus influenzae (n = 299) | 175 (58.5%) | 124 (41.5%) | 0 (0%) |
*There were 406 total nasopharyngeal samples for respiratory viruses and M. pneumoniae, 403 for S. pneumoniae and 299 for H. influenzae.
**Since all 299 H. influenzae samples were found to be negative, the frequencies for age category represent those children that had samples taken.