| Isolates | Blood culture | Sputum culture | Urinary antigen | BAL/BAS | Pleural effusion culture | Nasopharyngeal swab | Serology | |
| Patients n | 188 | 362 | 193 | 532 | 3 | 12 | 112 | 120 |
| Typical | 80 (42.6) | |||||||
| Streptococcus pneumoniae | 66 (35.1) | 16 (4.41) | 26 (13.5) | 34 (6.4) | 1 (33.3) | 3 (25.0) | NA | NA |
| Streptococcus viridans | 2 (1.1) | 1 (0.27) | NA | 2 (16.6) | NA | NA | ||
| Staphylococcus aureus | 1 (0.5) | 1 (0.5) | NA | NA | NA | |||
| Haemophilus influenzae | 9 (4.8) | 2 (0.55) | 9 (4.7) | NA | NA | NA | ||
| Escherichia coli | 1 (0.5) | 1 (0.27) | NA | NA | NA | |||
| Pseudomonas aeruginosa | 1 (0.5) | 1 (0.27) | 1 (0.5) | NA | NA | NA | ||
| Atypical | 63 (33.5) | |||||||
| Mycoplasma pneumoniae | 29 (15.4) | NA | NA | NA | NA | NA | NA | 29 (24.1) |
| Coxiella burnetii | 11 (5.9) | NA | NA | NA | NA | NA | NA | 11 (9.2) |
| Chlamydophila pneumoniae | 10 (5.3) | NA | NA | NA | NA | NA | NA | 10 (8.3) |
| Legionella pneumophila | 13 (6.9) | NA | NA | 13 (2.4) | NA | NA | NA | 4 (3.3) |
| Respiratory viruses | 25 (13.3) | NA | NA | |||||
| Influenza virus A | 14 (7.4) | NA | NA | NA | NA | NA | 10 (8.9) | 4 (3.3) |
| Rhinovirus | 6 (24.0) | NA | NA | NA | NA | NA | 6 (5.3) | |
| Influenza virus | 2 (1.1) | NA | NA | NA | NA | NA | 2 (1.8) | |
| Adenovirus | 1 (0.5) | NA | NA | NA | NA | NA | 1 (0.9) | |
| Respiratory syncytial virus | 1 (0.5) | NA | NA | NA | NA | NA | 1 (0.8) | |
| Parainfluenza virus 2 | 1 (0.5) | NA | NA | NA | NA | NA | 1 (0.8) | |
| Mixed | 17 (9.0) | |||||||
| S. pneumoniae + influenza virus A | 9 (52.9) | 1 (0.5) | 8 (1.5) | 9 (8.0) | ||||
| S. pneumoniae + rhinovirus | 1 (5.8) | 1 (0.2) | 1 (0.9) | |||||
| H. influenzae + influenza virus A | 2 (11.7) | 2 (1.0) | 2 (1.8) | |||||
| S. pneumoniae + P. aeruginosa | 1 (5.8) | 1 (0.5 ) | 1 (0.2 ) | |||||
| L. pneumophila + rhinovirus | 1 (5.8) | 1 (0.2) | 1 (0.9) | |||||
| S. pneumoniae + H. influenzae | 2 (11.7) | 2 (3.2) | 2 (0.4) | |||||
| S. pneumoniae + adenovirus | 1 (5.8) | 1 (0.2) | 1 (0.9) | |||||
| Others | 3 (1.6) | 3 (1.5) |
Data are presented as n (%), unless otherwise stated. BAL: bronchoalveolar lavage; BAS: broncho-aspirate; NA: not applicable.