Although the main cause of bronchiolitis is respiratory syncytial virus, it can be caused by other viruses like adenovirus, human bocavirus, and human metapneumovirus.

虽然细支气管炎的主要原因是呼吸道合胞病毒感染，但其他病毒感染也会导致细支气管炎，如腺病毒、人博卡病毒和人偏肺病毒。