Distribution of single and multiple viral and bacterial agents detected in 356 adults with community-acquired pneumonia
| Bacterial agents | ||||||
|---|---|---|---|---|---|---|
| Only bacteria (n=92) | Mixed bacterial and viral infections (n=60) | |||||
| Only one | Plus other bacteria | Plus virus | Plus virus and other bacteria | Total | ||
| N | % | |||||
| Streptococcus pneumoniae | 38 | 6 | 25 | 6 | 75 | 21.1 |
| Haemophilus influenzae | 3 | 3 | 0.8 | |||
| Moraxella catarrhalis | 1 | 3 | 2 | 6 | 1.7 | |
| Gram(–)bacillus | 1 | 2 | 2 | 5 | 1.4 | |
| Staphylococcus aureus | 3 | 1 | 2 | 2 | 8 | 2.2 |
| Streptococcus agalactiae | 1 | 1 | 0.3 | |||
| Mycoplasma pneumoniae | 13 | 5 | 13 | 1 | 32 | 9.0 |
| Chlamydia pneumoniae | 13 | 5 | 4 | 6 | 28 | 7.9 |
| Legionella pneumophila | 7 | 2 | 4 | 13 | 5.07* | |
| Subtotal cases with bacteria | 80 | 152† | 42.7 | |||
| Viral agents | ||||||
|---|---|---|---|---|---|---|
| Only viruses (n=80) | Mixed viral and bacterial infections (n=60) | |||||
| Only one | Plus other virus | Plus bacteria | Plus bacteria and other virus | Total | ||
| N | % | |||||
| RSV | 18 | 8 | 12 | 10 | 48 | 13.5 |
| hMPV | 8 | 14 | 10 | 9 | 41 | 11.5 |
| Flu | 12 | 5 | 7 | 3 | 27 | 7.6 |
| HCoV | 3 | 9 | 3 | 5 | 20 | 5.6 |
| Picornavirus | 17 | 11 | 9 | 4 | 41 | 11.5 |
| ADV | 1 | 2 | 3 | 0.8 | ||
| Subtotal cases with viruses | 59 | 140‡ | 39.3 | |||
| No agent | 124 | 34.8 | ||||
Santiago, Chile, February 2005–December 2007.
*13/256 cases=5.07%.
†Cases with unique bacteria or with bacteria plus other agent were counted as one individual case.
‡Cases with unique virus or with virus plus other agent were counted as one individual case.
ADV, adenovirus; HCoV, human coronavirus; hMPV, human metapneumovirus; RSV, respiratory syncytial virus.