Distribution of the main respiratory pathogens in patients with community-acquired pneumonia
| Age group | p-value | ||
| <65 yrs | ≥65 yrs | ||
| Patients n | 1298 | 1349 | |
| Pathogens detected n | 271 | 268 | |
| Streptococcus pneumoniae % | 42.1 | 43.3 | 0.85 |
| Gram-negative bacilli % | 3.7 | 7.1 | 0.17 |
| Staphylococcus aureus % | 1.5 | 2.2 | 0.74 |
| Haemophilus influenzae % | 4.8 | 3.4 | 0.53 |
| Chlamydia pneumoniae % | 1.1 | 0 | 0.26 |
| Mycoplasma pneumoniae % | 14.0 | 0.7 | 0.0005 |
| Legionella spp. % | 16.6 | 17.5 | 0.87 |
| Respiratory syncytial virus % | 1.8 | 3.7 | 0.29 |
| Influenza virus A % | 5.9 | 14.9 | 0.001 |