| BAL | bronchoalveolar lavage |
| CMV | cytomegalovirus |
| CT | computed tomograpy |
| FOB | fiberoptic bronchoscopy |
| HR | hazard ratio |
| HSCT | hematopoietic stem cell transplantation |
| HSV | herpes simplex virus |
| IPA | invasive pulmonary aspergillosis |
| MDR | multidrug-resistant |
| mNGS | metagenomic next-generation sequencing |
| OR | odds ratio |
| VA-LTRI | ventilator-associated lower respiratory tract infection |
| VAP | ventilator-associated pneumonia |
| VAT | ventilator-associated tracheobronchitis |
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