Frequency of isolation of causative organisms of community-acquired pneumonia in Europe by country* 2 5 10–53 55
| Pathogen | Percentage means of frequency of isolation in each country | ||||||||||||
| Denmark | Estonia | Finland | France | Ireland | Italy | Slovenia | Spain | Switzerland | Netherlands | Turkey | UK | Germany | |
| Streptococcus pneumoniae | 26.1 | 25.8 | 68.3 | 37.2 | 37 | 11.9 | 17.7 | 33.7 | 48.9 | 44.5 | 25.5 | 42.1 | 40 |
| Haemophilus influenzae | 10.7 | 2.4 | 6.6 | 10.3 | 18 | 5.1 | 2.9 | 5.3 | 14.6 | 12.3 | 44.9 | 12.3 | 8 |
| Legionella spp. | 4.3 | 0 | 0 | 2.0 | 0 | 4.9 | 2.9 | 12.9 | 8.6 | 6.7 | 0 | 9.1 | 3.1 |
| Staphylococcus spp. | 1.6 | 4.3 | 0 | 11.7 | 0 | 6.5 | 0 | 3.2 | 9.1 | 1.0 | 1.0 | 2.6 | 5 |
| Moraxella catarrhalis | 1.1 | 12.0 | 4.4 | 3.3 | 10 | 1.0 | 2.9 | 2.7 | 5.5 | 1.0 | 12.2 | 0.8 | 0 |
| Gram-negative bacilli | 2.7 | 41.6 | 0 | 16.8 | 0 | 24.3 | 1.5 | 7.9 | 4.7 | 9.4 | 4.1 | 2.6 | 7 |
| Mycoplasma pneumoniae | 9.5 | 6.2 | 16.34 | 0.7 | 1.3 | 7.0 | 32.4 | 8.4 | 9.7 | 14.0 | 0 | 5.3 | 5.6 |
| Chlamydophila spp. | 1.6 | 5.3 | 20.2 | 1 | 0 | 2.4 | 26.5 | 7.2 | 3.2 | 7.6 | 0 | 5.9 | 1.3 |
| Coxiella burnetii | 0 | 0 | 0 | 0.2 | 0 | 0.4 | 0 | 6.2 | 0 | 0.7 | 0 | 0.3 | 0 |
| Viruses | 6.3 | 0 | 15.9 | 1.7 | 0 | 11.6 | 0 | 5.9 | 0 | 16.5 | 0 | 18.6 | 9 |
| No pathogen identified | 59.8 | 52.4 | 39.8 | 35.6 | 39.4 | 67.3 | 39.8 | 56.8 | 67.1 | 35.3 | 40.6 | 38.4 | NR |
↵* Data are presented as percentage means of frequency of isolation of the respective pathogens from the studies included.
NR, not reported.