Respiratory Syncytial Virus (RSV) is the leading cause of hospitalization in all children less than 12 months of age in the United States and is a common illness affecting high-risk individuals, especially premature babies. RSV is dangerous for premature babies because they often lack fully-developed airways. Infants born prematurely do not have the immunity to help fight off viruses because they were born early.
The National Perinatal Association