The most common causes for viral pneumonia are influenza, parainfluenza, adenovirus, and respiratory syncytial virus (RSV appears mostly in children).

• 病毒性肺炎最常见的病原是流感病毒，副流感病毒，腺病毒，以及呼吸道合胞体病毒(RSV主要发生于儿童)。