RSV is a viral illness that causes symptoms such as trouble breathing. It's the most common cause of inflammation of the small airways in the lungs (bronchiolitis) and pneumonia in babies.

RSV is spread when a child comes into contact with fluid from an infected person's nose or mouth. It can happen if a child touches a contaminated surface and touches their eyes, mouth, or nose. It may also happen when inhaling droplets from an infected person's sneeze or cough.

All children are at risk for RSV. It is very contagious. RSV often happens in yearly outbreaks in communities, classrooms, and childcare centers. It's more common in the fall and winter.

RSV can affect a person of any age but the very young are most at risk of severe illness. Most babies have been infected at least once by the time they are 2 years old. Babies can also be reinfected with the virus. Infection can happen again anytime throughout life. RSV infection can cause an asthma attack. Kids with asthma are at higher risk for dangerous breathing problems. Babies born prematurely or with heart, lung, or immune system diseases are at increased risk for more severe illness.

Symptoms start about 2 to 5 days after contact with the virus.

The early phase of RSV in babies and young children is often mild, like a cold. In children younger than age 3, the illness may move into the lungs and cause coughing and wheezing. In some children, the infection turns to a severe respiratory disease. Your child may need to be treated in the hospital to help with breathing.

The most common symptoms of RSV include:

• Runny nose.
• Fever.
• Cough.
• Short periods without breathing (apnea).
• Trouble eating, drinking, or swallowing.
• Wheezing.
• Flaring of the nostrils or straining of the chest or stomach while breathing.
• Breathing faster than normal, or trouble breathing.
• Turning blue around the lips and fingertips.

The symptoms of RSV can seem like other health conditions. Make sure your child sees their doctor for a diagnosis.

The doctor will ask about your child's symptoms and health history. They may also ask about any recent illness in your family or other children in childcare or school. They will give your child a physical exam. Your child may also have tests, such as a nasal swab or wash. This is a painless test to look for the virus in fluid from the nose.

Treatment will depend on your child's symptoms, age, and general health. It will also depend on how severe the condition is.

Antibiotics are not used to treat RSV. Treatment for RSV is done to help ease symptoms. It varies by how serious the symptoms are. Treatment may include:

• More fluids. It's very important to make sure your child drinks plenty of fluids. If needed, your child will get an I.V. (intravenous) line to give fluids and electrolytes.
• Oxygen. Extra oxygen is given through a mask, nasal prongs, or an oxygen tent.
• Suctioning of mucus. A thin tube is put into the lungs to remove extra mucus.
• Bronchodilator medicines. These may be used to open your child's airways. They are often given in an aerosol mist by a mask or through an inhaler.
• Tube feeding. This may be done if a baby has trouble sucking. A thin tube is put through the baby's nose and down into the stomach. Liquid nutrition is sent through the tube.
• Mechanical ventilation. A child who is very ill may need to be put on a breathing machine (ventilator) to help with breathing.
• Antiviral medicine. Some children with severe infections may need treatment with an antiviral medicine.

Talk with your child's doctors about the risks, benefits, and possible side effects of all treatments.

In high-risk babies, RSV can lead to severe breathing problems and pneumonia. It may become life-threatening. Having RSV as a baby may be linked to having asthma later in childhood.

To prevent severe RSV disease in infants, the CDC recommends either of these:

• Maternal RSV vaccination at 32 through 36 weeks of pregnancy, given immediately before or during RSV season
• Infant vaccination with an RSV monoclonal antibody for babies 8 months and younger born during or entering their first RSV season.

Most infants will not need both.

An RSV monoclonal antibody may also be advised for some infants and children ages 8 months through 19 months who are at increased risk for severe RSV disease and entering their second RSV season.

To reduce the risk for RSV, the American Academy of Pediatrics recommends all babies, especially preterm babies:

• Be breastfed.
• Be protected from contact with smoke.
• Not go to childcare with lots of children during their first winter season.
• Not have contact with people who are sick.

Also make sure that household members wash their hands or use an alcohol-based hand cleaner before and after touching your baby. Don't allow people to smoke in your home or in your car. Remove your baby from any area where people are smoking.

Contact the doctor if:

• Your child has symptoms that don't get better, or that get worse.
• Your child has new symptoms.

• RSV is a viral illness that causes trouble breathing. It is more common in winter and early spring months.
• Most babies have been infected at least once by the time they are 2 years old. Babies can also be reinfected with the virus. Infection can happen again anytime throughout life.
• Either a maternal RSV vaccine or an RSV monoclonal antibody shot for your baby will be recommended to prevent RSV in your baby.
• Treatment for RSV may include extra oxygen. The oxygen is given through a mask, nasal prongs, or an oxygen tent. A child who is very ill may need to be put on a breathing machine (ventilator) to help with breathing.
• In high-risk babies, RSV can lead to severe respiratory illness and pneumonia. This may become life-threatening. RSV as a baby may be linked to asthma later in childhood.
• Babies and children at highest risk for RSV infection may get a different monoclonal antibody medicine. This is given as a series of shots (injections) each month during RSV season.
• Don't let anyone smoke around your baby. Make sure no one touches your baby without first carefully washing their hands.

Tips to help you get the most from a visit to your child's doctor:

• Know the reason for the visit and what you want to happen.
• Before your visit, write down questions you want answered.
• At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also write down any new instructions your doctor gives you for your child.
• Know why a new medicine or treatment is prescribed and how it will help your child. Also know what the side effects are.
• Ask if your child's condition can be treated in other ways.
• Know why a test or procedure is recommended and what the results could mean.
• Know what to expect if your child does not take the medicine or have the test or procedure.
• If your child has a follow-up appointment, write down the date, time, and purpose for that visit.
• Know how you can contact your child's doctor after office hours. This is important if your child becomes ill and you have questions or need advice.