Bronchoaleolar laage, oropharyngeal swabs, and bronchial biopsies (presence of macroscopic bronchial lesions) were obtained for all who deteriorated clinically with suspected lung infection.

• 对临床病情恶化怀疑肺部感染的患者，取支气管肺泡灌洗、咽拭子、支气管活检（存在肉眼可见的支气管损伤者）。