Viruses. Viruses that infect the upper respiratory tract may also cause pneumonia. The influenza virus is the most common cause of viral pneumonia in adults. Respiratory syncytial virus (RSV) is the most common cause of viral pneumonia in young children.
Answers & Comments
Answer:
Viruses. Viruses that infect the upper respiratory tract may also cause pneumonia. The influenza virus is the most common cause of viral pneumonia in adults. Respiratory syncytial virus (RSV) is the most common cause of viral pneumonia in young children.