Table 3.
Etiology in 1123 Cases of CAPa
| Etiology | VBC-CAP (n = 57) | V-CAP (n = 98) | B-CAP (n = 968) |
|---|---|---|---|
| Streptococcus pneumoniae | 46 (80.70%) | – | 612 (63.22%) |
| Haemophilus influenzae | 5 (8.77%) | – | 73 (7.6%) |
| Staphylococcus aureus | 4 (7.01%) | – | 21 (2.2%) |
| Chlamydophila pneumoniae | 1 (1.75%) | – | 40 (4.1%) |
| Moraxella catarrhalis | 1 (1.75%) | – | 13 (1.3%) |
| Legionella spp | 0 | – | 48 (5%) |
| Coxiella burnetti | 0 | – | 1 (0.1%) |
| Pseudomonas aeruginosa | 0 | – | 36 (3.7%) |
| Gram-negative bacilli | 0 | – | 17 (17.56%) |
| Aspiration CAP | 1 (1.75%)b | – | 107 (11.1%)c |
| Influenza A H1N1 | 38 (66.66%) | 84 (85.7%) | – |
| Influenza A H3N2 | 9 (15.78%) | 13 (13–3%) | – |
| Influenza B | 8 (14.03%) | 1 (1%) | – |
| Respiratory syncytial virus | 2 (3.50%) | 0 | – |
Abbreviations: B-CAP, bacterial community-acquired pneumonia; CAP, community-acquired pneumonia; V-CAP, viral CAP; VBC-CAP, viral and bacterial coinfection CAP.
aProportions were calculated as percentages of patients with available data.
bOnly 1 case was microbiologically confirmed in VBC-CAP group: Enterobacter cloacae (n = 1).
cCases microbiologically confirmed in B-CAP group: Bacteroides spp (n = 3) Prevotella bivia (n = 4), Porphyromonas asaccharalytica (n = 2), Streptococcus anginosus group (n = 5), Eggerthela lenta (n = 4), Enterobacter cloacae (n = 3).