Respiratory syncytial virus, or RSV, is a common virus. It spreads through coughing and sneezing. You can also get RSV by touching surfaces that have RSV on them, then touching your eyes, nose, or mouth. Most children get RSV by the time they are 2 years old.
Healthy children usually experience mild, cold-like symptoms and recover on their own within a week or two. But RSV can cause severe lung infections, including bronchiolitis (infection of tiny breathing passages) and pneumonia. Each year in the United States, 75,000 to 125,000 babies younger than 1 year old are hospitalized due to RSV infection.