Table 3.
Pathogens Detected
| Pathogens Detected, No. (%) | CT-Only Pneumonia (n = 66) | Pneumonia on Chest Radiography (n = 2,185) | P Value |
|---|---|---|---|
| Any pathogen | 27 (40.9) | 822 (37.6) | .59 |
| Codetection of ≥ 1 pathogen | 2 (3.0) | 108 (4.9) | .48 |
| Any bacteria | 8 (12.1) | 297 (13.6) | .86 |
| Streptococcus pneumoniae | 3 (4.6) | 111 (5.1) | .00 |
| Group A streptococcus | 0 (0) | 7 (0.32) | .65 |
| Viridans group streptococci | 0 (0) | 8 (0.37) | .62 |
| Other streptococcal species | 0 (0) | 8 (0.4) | .62 |
| Staphylococcus aureus | 0 (0) | 37 (1.7) | .63 |
| Haemophilus influenzae | 0 (0) | 13 (0.6) | .00 |
| Escherichia coli | 1 (1.5) | 16 (0.7) | .47 |
| Pseudomonas aeruginosa | 1 (1.5) | 7 (0.3) | .11 |
| Klebsiella pneumoniae | 2 (3.0) | 10 (0.5) | .01 |
| Mycoplasma pneumoniae | 0 (0) | 43 (2.0) | .64 |
| Chlamydia pneumoniae | 1 (1.5) | 8 (0.4) | .24 |
| Legionella pneumophila | 0 (0) | 32 (1.5) | .62 |
| Other bacteriaa | 0 | 9 (0.4) | .60 |
| Any virus | 20 (30.3) | 570 (26.1) | .44 |
| Influenza | 4 (6.1) | 126 (5.8) | .92 |
| Parainfluenza virus | 1 (1.5) | 66 (3.0) | .72 |
| Coronavirus | 0 (0) | 53 (2.4) | .41 |
| Human metapneumovirus | 4 (6.1) | 84 (3.8) | .36 |
| Respiratory syncytial virus | 0 (0) | 68 (3.1) | .26 |
| Human rhinovirus | 11 (16.7) | 182 (8.3) | .02 |
| Adenovirus | 1 (1.5) | 31 (1.4) | .62 |
a
Other bacteria included Fusobacteria (3 cases), Enterobacter (2 cases), Neisseria, Bacteroides, Pasteurella, and Proteus.