| Mixed viral and bacterial pathogens: | |
| Influenza A plus: | |
| Streptococcus pneumoniae | 5 |
| Streptococcus pneumoniae and Chlamydia pneumoniae | 1 |
| Haemophilus influenzae | 1 |
| Legionella pneumophila | 1 |
| Pseudomonas aeruginosa | 1 |
| Influenza B plus: | |
| Staphylococcus aureus | 2 |
| Streptococcus pneumoniae | 1 |
| Legionella pneumophila | 1 |
| Rhinovirus plus: | |
| Streptococcus pneumoniae | 11 |
| Haemophilus influenzae | 2 |
| Respiratory syncytial virus plus: | |
| Streptococcus pneumoniae | 4 |
| Haemophilus influenzae | 1 |
| Moraxella catarrhalis | 1 |
| Pseudomonas aeruginosa | 1 |
| Adenovirus plus: | |
| Haemophilus influenzae | 2 |
| Streptococcus pneumoniae | 1 |
| Parainfluenza virus plus: | |
| Streptococcus pneumoniae | 3 |
| Haemophilus influenzae | 1 |
| Coronavirus plus: | |
| Streptococcus pneumoniae | 2 |
| Multiple viral pathogens: | |
| Influenza A and adenovirus | 1 |
| Influenza A and coronavirus 229E | 1 |
| Influenza A and rhinovirus and Haemophilus influenzae | 1 |
| Influenza A and rhinovirus and Streptococcus pneumoniae | 1 |
| Rhinovirus and respiratory syncytial virus | 1 |
| Respiratory syncytial virus and coronavirus 229E and Haemophilus influenzae | 1 |
| Adenovirus and coronavirus 229E | 1 |
| Total | 49 |