Respiratory syncytial virus (RSV) is a highly contagious, seasonal lung infection. It’s a common childhood illness that can affect adults too. Most cases are mild, with cold-like symptoms. Severe infection leads to pneumonia and bronchiolitis.

Is RSV a serious illness?

Respiratory syncytial (sin-SISH-uhl) virus, or RSV, is a common respiratory virus that usually causes mild, cold-like symptoms. Most people recover in a week or two, but RSV can be serious, especially for infants and older adults.

Is RSV life-threatening?

Infection can happen again anytime throughout life. In high-risk babies, RSV can lead to severe respiratory illness and pneumonia. This may become life-threatening.

Respiratory syncytial virus enters the body through the eyes, nose or mouth. It spreads easily through the air on infected respiratory droplets. You or your child can become infected if someone with RSV coughs or sneezes near you. The virus also passes to others through direct contact, such as shaking hands.