Respiratory Syncytial Virus (RSV)

Respiratory syncytial (sin-SISH-ul) virus (RSV) is a major cause of respiratory illness in children. The virus usually causes a common cold. But sometimes it infects the lungs and breathing passages and can cause breathing problems in babies and young children.

Kids with RSV might have cold symptoms, such as:

Sometimes, an RSV infection can lead to:

Call your health care provider if your child:

Also call if your baby is very cranky or refuses to breastfeed or bottle-feed.

Get medical help right away if your child:

Learn ways to keep your child with RSV comfortable and breathing well at home, and when to get help.

Respiratory syncytial virus is highly contagious. It spreads through droplets containing the virus when an infected person coughs or sneezes. It also can live on surfaces (like counters or doorknobs) and on hands and clothing. So people can get it if they touch something that's contaminated.

RSV can spread quickly through schools and child care centers. Babies often get it when older kids carry the virus home from school and pass it to them. Almost all kids have had an RSV infection at least once by the time they're 2 years old.

RSV infections are most common from fall through spring. Respiratory illnesses caused by RSV — such as bronchiolitis or pneumonia — usually last about a week, but some symptoms, such as a cough, can last several weeks.

Because RSV can spread easily by touching infected people or surfaces, washing hands well and often can help stop it. Wash your hands after being around someone who has cold symptoms. School-age kids who have a cold should keep away from younger siblings — especially babies — until their symptoms clear up.

An RSV vaccine is recommended for all pregnant women who are at 32–36 weeks of their pregnancy from September through January. This vaccine can protect the newborn from severe RSV illness.

Doctors also can give babies a shot that contains 

antibodies against RSV as another way to protect them. This shot works a little differently from routine vaccines. Its antibodies protect a baby from the virus for several months. It can be given to:

If the RSV vaccine is given to the mother during pregnancy, the baby will likely not need the antibody shot. If a baby is born less than 2 weeks after the mother got the vaccine, the doctor might recommend the shot to make sure the baby is well protected.

In kids, other respiratory viruses such as flu and COVID-19 can cause symptoms similar to those from RSV. Talk to the doctor to make sure your child is up to date on recommended vaccines.

Health care providers usually diagnose a respiratory virus by taking a medical history and doing an exam. In many kids, they don't need to distinguish RSV infection from a common cold.

But if a child has other health conditions or more serious symptoms, doctors might want to make a specific RSV diagnosis. In that case, they identify the virus by testing nasal fluids. The sample is collected either with a cotton swab or by suction through a bulb syringe.

Most cases of respiratory syncytial virus infection are mild and don't need medical treatment. Antibiotics aren't used because RSV is a virus — antibiotics work only against bacteria.

RSV infection can be more serious in babies and toddlers, though. Some might need treatment in a hospital where they can be watched closely and get supportive treatment for any breathing problems or dehydration.

Avoid hot-water and steam humidifiers, which can be hazardous and can scald skin. If you use a cool-mist humidifier, clean it daily to prevent mold and bacteria growth.

If your child is too young to blow the nose, use saline (saltwater) nose spray or drops and a nasal aspirator (or bulb syringe) to remove sticky nasal fluids. Clearing a baby's nose before offering fluids can make it easier for them to drink.

Treat discomfort from a fever by using a non-aspirin fever medicine like acetaminophen or, if your child is older than 6 months, ibuprofen. Do not give aspirin to children who have a viral illness. Such use is linked to Reye syndrome, which can be life-threatening. Do not use over-the-counter cold medicines, which can be dangerous for young children.