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Respiratory Syncytial Virus

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Respiratory syncytial virus (RSV) infects almost all children at least once before they are 2 years of age. Most of the time, this virus only causes minor cold-like symptoms. However, for some babies infection can be more dangerous.

For certain infants who are born extremely preterm (before 29 weeks of pregnancy) or who are born with severe heart or lung disease, any viral infection can be more serious. Very preterm infants often have underdeveloped lungs and may have difficulty fighting a viral infection once they become infected.

Each year, about 100,000 young children are hospitalized in the United States with RSV infection, and approximately 100 of these children may die. In the first 2 years of life, RSV is the leading cause of pneumonia and bronchiolitis (a swelling of the small airways), and it may be associated with wheezing.

Who is at risk?

Infants born prematurely and term infants younger than 6 weeks are at increased risk for developing serious RSV infection. Young children with medical conditions, such as chronic lung disease, serious heart conditions, or problems with their immune system—including problems due to cancer or organ transplants— are also at risk.

When and how is RSV spread?

Respiratory syncytial virus infection occurs most often from late fall to early spring. Most illness occurs between November and April, although there may be seasonal variation by region. Respiratory syncytial virus occurs only in humans and is highly contagious. The virus can live for several hours on a surface such as a countertop, table, or playpen, or it can live on unwashed hands. Respiratory syncytial virus is spread by direct or close physical contact, which includes touching or kissing an infected person or contact with a contaminated surface.

What are the symptoms of RSV?

For most healthy children, the symptoms of RSV resemble the common cold and include

  • Runny nose

  • Coughing

  • Low-grade fever

However, signs of more serious infection may include

  • Difficult or rapid breathing

  • Wheezing

  • Irritability and restlessness

  • Poor appetite

How can I protect my child from RSV?

There are important steps you can take to prevent exposure to RSV and other viruses, especially in the first few months of your child's life. These precautions include

  • Make sure everyone washes their hands before touching your baby.

  • Keep your baby away from anyone who has a cold, fever, or runny nose.

  • Keep your baby away from crowded areas such as shopping malls.

  • Keep your baby away from tobacco smoke. Parents should not expose their infants and young children to secondhand tobacco smoke, which increases the risk of and complications from severe viral respiratory infections.

  • For high-risk infants, participation in child care should be restricted during RSV season whenever possible.

  • All high-risk infants and their contacts should be immunized against influenza beginning at 6 months of age.

There is a medicine that your child's doctor may consider that could reduce the risk of developing RSV infection. This medicine is used only for the very small number of babies who are in the highest risk groups for hospitalization. The American Academy of Pediatrics has developed specific criteria for use of this medicine. You should consult with your child’s doctor regarding specific details on who is at highest risk and which high-risk infants are most likely to benefit from receipt of this medicine.

How is RSV infection treated?

Most cases of RSV infection are mild and disappear on their own within 5 to 7 days. However, if your baby is experiencing severe respiratory symptoms, your child's doctor may use a nasal secretion test to determine the cause of the infection. If your baby needs to be hospitalized, your child's doctor will discuss the best management for your baby.

Call your child's doctor right away if your infant shows any signs of serious RSV infection. Prompt supportive treatment is especially important if your infant is at high risk for developing serious RSV infection.

Copyright © 2003, American Academy of Pediatrics. All Rights Reserved.

Additional Resources

The Center for Young Women’s Health (CYWH) is a collaboration between the Division of Adolescent and Young Adult Medicine and the Division of Gynecology at Boston Children’s Hospital. The Center is an educational entity that exists to provide teen girls and young women with carefully researched health information, health education programs, and conferences.
Young Men’s Health (YMH) is produced by the Division of Adolescent and Young Adult Medicine at Boston Children’s Hospital. The purpose of the website is to provide carefully researched health information to teenage boys and young men.
The mission of girlshealth.gov is to promote healthy, positive behaviors in all girls. Girlshealth.gov gives girls reliable, useful information on the health issues they will face as they become young women, and tips on handling relationships with family and friends, at school and at home.
Information for employed teens.

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