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Etiologies of Common Pneumonias
| Type | Percentage |
|---|---|
| Viral (influenza) | 20 (3) |
| Mycoplasmal | 10–20 |
| Bacterial | 12 |
| Bacterial superimposed on viral | 6 |
| Chlamydia | 10 |
| Unknown cause (Legionnaires’ disease, toxic) | 38 |
Data from Branch WT Jr. Office practice of medicine. Philadelphia: Saunders; 1982: 57–76.
