Why does a respiratory syncytial viral infection have little adverse effect on an older child but is often life-threatening to a younger child?

Question

Quizplus · Accepted Answer

In young children, the respiratory bronchioles are commonly attacked by viruses, such as respiratory syncytial virus (RSV), resulting in respiratory failure. The same infection will have little or no respiratory effect on an adult or older child with a larger number of terminal airways.

Why Does a Respiratory Syncytial Viral Infection Have Little Adverse