Which age group is most susceptible to RSV?

Respiratory Syncytial Virus (RSV) is a significant viral infection that primarily affects the respiratory system. Newborns and infants are particularly vulnerable to RSV due to their underdeveloped immune systems and smaller airways. This demographic experiences the highest rates of severe illness, including bronchiolitis and pneumonia, which can lead to hospitalization.

The physiological differences in newborns, like the immaturity of their lungs and the relatively higher prevalence of pre-existing conditions (such as congenital heart defects or prematurity), exacerbate the risk associated with RSV. These factors combined mean that the disease can lead to more severe respiratory distress or complications in very young children than in older children or adults, who typically can handle the virus better.

In contrast, while preschool-aged children are also at risk of RSV, they tend to have stronger immune responses compared to newborns and have often been exposed to RSV previously, which provides some level of immunity. Adolescents and adults generally have robust immune systems and are less likely to experience severe complications from RSV. This important distinction highlights why newborns are considered the most susceptible age group for this respiratory virus.