Viral infections in non-bronchoalveolar lavage (BAL) and BAL groups
| All patients | Non-BAL group (bronchial aspiration) | BAL group | p-value | |
| Subjects n | 200 | 93 | 107 | |
| ≥1 infection | 91 (45.5) | 50 (52) | 41 (38) | 0.029 |
| Adenovirus | 21 (10.5) | 18 (19) | 3 (2.8) | <0.001 |
| Enterovirus | 14 (7) | 9 (9.7) | 5 (4.7) | 0.17 |
| Parainfluenza virus | 7 (3.3) | 5 (5.4) | 2 (1.9) | 0.25 |
| Metapneumovirus | 4 (2) | 4 (4.3) | 0 (0) | 0.045 |
| Influenza virus# | 8 (4) | 6 (8.1) | 2 (1.9) | 0.067 |
| Respiratory syncytial virus# | 8 (4) | 6 (8.1) | 2 (1.9) | 0.067 |
| Rhinovirus¶ | 37 (18.5) | 12 (52) | 25 (24) | <0.01 |
| Bocavirus¶ | 10 (5) | 4 (17) | 6 (5.7) | 0.079 |
| Coronavirus¶ | 10 (5) | 2 (8.7) | 8 (7.6) | 1 |
Data are presented as n (%) unless otherwise stated. #: researched respectively in 74 patients in the non-BAL group and 105 patients in the BAL group; ¶: researched respectively in 23 patients in the non-BAL group and in 105 patients in the BAL group.