Table 2.
Etiologic agents of pneumonia in 122 patientsab
| Bacteria | |
|---|---|
| Recognized bacterial pathogens | |
| Streptococcus pneumoniae | 24 |
| Haemophilus influenzae | 31 |
| Staphylococcus aureus | 11 |
| Moraxella catarrhalis | 8 |
| Klebsiella sp. | 1 |
| Pseudomonas aeruginosa | 5 |
| Other | 2 |
| Commensal bacteria | |
| Streptococcus mitis/oralis, or mixed | |
| viridans including S. mitis | 30 |
| Corynebacteria | 8 |
| Other | 20 |
| Viruses | |
| Rhinovirus | 13 |
| Influenza | 15 |
| Parainfluenza | 2 |
| Human metapneumovirus | 5 |
| Respiratory syncytial | 5 |
| Adenovirus | 1 |
| Bacterial/viral coinfection | |
| Influenza + recognized bacteria | 6 |
| Influenza + commensals | 4 |
| Other viruses + recognized bacteria | 8 |
| Other viruses + commensals | 9 |
| Chlamydophila | 0 |
| Mycoplasma | 0 |
| Fungi | 0 |
aTotal number of identified organisms exceeds total number of cases because > 1 organism was identified in many cases
bWhen commensal organisms were identified together bacterial pathogens, we followed convention by not mentioning them, even though their presence in large numbers by Gram stain and quantitative bacteriology suggests that they contributed to the pneumonia