RSV (Respiratory Syncytial Virus) Infection

RSV (respiratory syncytial virus) is a common cause of respiratory infections in people of all ages. RSV occurs more often in the winter and early spring. RSV is so common that almost all children have had the virus by age 2. Older adults and people who have weak immune systems can get RSV again later in life. This is because their immunity to RSV goes down over time. RSV symptoms are often mild. But RSV can be a serious problem for high-risk infants, young children, and older adults. These groups may have more serious infections and trouble breathing.

How RSV spreads

RSV spreads easily when a person with the infection coughs or sneezes. It spreads by direct contact with an infected person. For example, kissing a child with RSV spreads the virus. And the virus can live on hard surfaces. A person can get RSV by touching something with the virus on it. These can include crib rails and doorknobs. It spreads quickly in group settings, such as daycare and schools.

Man coughing and spreading droplets into air. Toddler breathes in droplets.
Viruses that cause RSV spread through the air in droplets when someone who has RSV coughs, sneezes, laughs, or talks.

Symptoms of RSV

Most babies and children with RSV have the same symptoms as a cold or flu. These include a stuffy or runny nose, a cough, headache, and a low-grade fever. Some may develop bronchiolitis. This condition is when the small airways in the lungs (bronchioles) become inflamed. It causes wheezing, shortness of breath, fast breathing, and increased cough. Children, older adults, and people with a very weak immune system may get pneumonia.

Treating RSV

RSV most often goes away on its own. There is no treatment for RSV in most cases. Care for babies, children, and adults is generally supportive to manage symptoms. Antibiotics are not used unless a bacterial infection develops. 

To ease symptoms:

  • Manage fever. Ask your healthcare provider or nurse about lowering you or your child's fever. Know what medicine to use and how much and how often to use it. You also need to know which medicines not to use. For example, never give children and teens aspirin or any medicines containing aspirin. It's linked with side effects, such as an upset stomach, intestinal bleeding and, most seriously, Reye syndrome.

  • Dress in layers to not get overheated. Make sure your child isn't wearing too much clothing. 

  • Stay hydrated. If your child is old enough, give them fluids, such as water and juice.

  • Treat a stuffy nose. For babies and young children, remove mucus from their nose with a rubber bulb suction device. Be gentle so you don't cause more swelling and mild pain. Ask your child’s provider or nurse for instructions. Consider using a steam or heated humidifier to open blocked nasal passages. Older children and adults can stand in a warm shower.

  • Avoid tobacco smoke. Don’t let anyone smoke around your child. Stay out of public areas where smoking occurs.

For severe symptoms

People with severe symptoms need to be treated in the hospital. They are watched closely. They may have treatment such as:

  • IV (intravenous) fluids

  • Oxygen 

  • Suctioning of mucus

  • Breathing treatments

  • Anti-inflammatory medicine such as steroids

Those with very serious breathing problems have a breathing tube. The tube is put in the throat and down into the lungs. This is called intubation. The tube is attached to a machine (ventilator) that helps them breathe.  

When to call the healthcare provider

Call your provider right away if you or your child have any of these symptoms:

  • Fever (see Fever and children below) . For adults, call for a fever of 100.4° F ( 38°C) or higher, or fever that doesn't go down with medicine, or as advised by your healthcare provider.

  • A seizure with a high fever

  • A cough that's getting worse or with colored mucus or blood

  • Wheezing, breathing faster than normal, or trouble breathing

  • Flaring the nostrils or straining the chest or stomach while breathing (most commonly in young children)

  • Skin around the mouth or fingers that turns a blue color

  • Restlessness or grouchiness, can't be soothed

  • Trouble eating, drinking, or swallowing

  • Shortness of breath

  • Confusion

  • Dizziness

  • Needing to sit upright (in bed or in a chair) to breathe or catch breath

Fever and children

Use a digital thermometer to check your child’s temperature. Don’t use a mercury thermometer. There are different kinds and uses of digital thermometers. They include:

  • Rectal. For children younger than 3 years, a rectal temperature is the most accurate.

  • Forehead (temporal). This works for children age 3 months and older. If a child under 3 months old has signs of illness, this can be used for a first pass. The provider may want to confirm with a rectal temperature.

  • Ear (tympanic). Ear temperatures are accurate after 6 months of age, but not before.

  • Armpit (axillary). This is the least reliable but may be used for a first pass to check a child of any age with signs of illness. The provider may want to confirm with a rectal temperature.

  • Mouth (oral). Don’t use a thermometer in your child’s mouth until they are at least 4 years old.

Use a rectal thermometer with care. Follow the product maker’s directions for correct use. Insert it gently. Label it and make sure it’s not used in the mouth. It may pass on germs from the stool. If you don’t feel OK using a rectal thermometer, ask the healthcare provider what type to use instead. When you talk with any healthcare provider about your child’s fever, tell them which type you used.

Below is when to call the healthcare provider if your child has a fever. Your child’s healthcare provider may give you different numbers. Follow their instructions.

When to call a healthcare provider about your child’s fever

For a baby under 3 months old:

  • First, ask your child’s healthcare provider how you should take the temperature.

  • Rectal or forehead: 100.4°F (38°C) or higher

  • Armpit: 99°F (37.2°C) or higher

  • A fever of ___________as advised by the provider

For a child age 3 months to 36 months (3 years):

  • Rectal or forehead: 102°F (38.9°C) or higher

  • Ear (only for use over age 6 months): 102°F (38.9°C) or higher

  • A fever of ___________ as advised by the provider

In these cases:

  • Armpit temperature of 103°F (39.4°C) or higher in a child of any age

  • Temperature of 104°F (40°C) or higher in a child of any age

  • A fever of ___________ as advised by the provider

Preventing RSV infection

To help prevent the infection:

  • Clean your hands before and after holding or touching your child. Use an alcohol-based hand cleaner that contains at least 60% alcohol. Or wash your hands with soap and clean, running water for at least 20 seconds. 

  • Clean all surfaces with disinfectant cleaners or wipes.

  • Teach your child how to wash their hands correctly and when to wash them. Have your child wash their hands often. Teach them to wash their hands for as long as it takes to sing the ABC song or the Happy Birthday song. Or have them use an alcohol-based hand cleaner that contains at least 60% alcohol.

  • Have all family members or caregivers clean their hands before and after holding or touching your child.

  • Closely watch your own health and that of family members and your child’s friends. Try to prevent contact between your child and those with a cold or fever.

  • Don’t smoke around your child, and don't let anyone else smoke around your child, including caregivers and family members. Don't smoke in your house or car. Keep your child out of any area where smoking occurs.

  • Ask your child's healthcare provider if your child is at risk for RSV. Babies and children at high risk for RSV infection may get a medicine called monoclonal antibodies. These are given as a series of shots (injections) during RSV season. They help prevent the illness in premature babies or kids with health problems like certain heart conditions. A single RSV antibody shot for all babies under 8 months and some older babies at risk for severe RSV been approved by the FDA and CDC.

  • Talk with your healthcare provider if you are age 60 or older. An RSV vaccine is available to help protect adults in this age group from RSV. Your healthcare provider can give you more information.


Date last modified: 8/4/2023

Online Medical Reviewer: Barry Zingman MD
Online Medical Reviewer: L Renee Watson MSN RN
Online Medical Reviewer: Marianne Fraser MSN RN
Date Last Reviewed: 2/1/2022
© 2000-2024 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.