Respiratory Syncytial Virus (RSV)

What is Respiratory Syncytial Virus (RSV)?

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RSV is the most common cause of lower-respiratory-tract infection in infancy or childhood. RSV is highly contagious and nearly all children have been infected at least once by the time they reach their second birthday. RSV causes cold-like symptoms that can trigger chronic breathing difficulties if the lungs become involved. 

Who is at risk?

Babies born prematurely as well as those with chronic lung disease or congenital heart disease are at the highest risk of severe disease and hospitalisation due to RSV. While adults and healthy children can normally cope with the mild cold-like symptoms of an infection, at risk infants are at a high-risk of being admitted into hospital. In babies who are born prematurely or who have lung or heart complications, RSV may cause life-threatening conditions requiring intensive care. 

How common is RSV?

Up to 90% of bronchiolitis hospitalisations and up to 50% of hospital admissions caused by winter pneumonia are caused by RSV. 

What is the worst time of year to catch RSV?

RSV occurs in seasonal outbreaks, usually through autumn to winter.  

What are the symptoms of RSV?

RSV typically begins with a mild fever, runny nose, and sore throat, mild cough, blocked nose and ear infection. Signs of more serious disease include wheezing, difficulty breathing, strong cough and trouble eating, drinking or sleeping. 

In premature infants, infants with congenital heart disease, chronic lung disease, or a compromised immune system, RSV can cause serious respiratory complications, such as pneumonia or bronchiolitis. 

In healthy adults and older children, RSV usually causes only a mild cold. 

How is RSV spread?

RSV is transmitted easily from person to person through physical contact, coughing and sneezing. RSV can live for hours on surfaces such as doorknobs and toys. 

Because RSV spreads so easily, infection control is very important, particularly in individuals at high risk of infection. 

What can parents do to prevent RSV?

There are simple steps parents can take such as:

  • Washing hands with soap and water before touching your baby
  • Using a tissue when you cough or sneeze, and disposing of it immediately
  • Keeping your baby away from other people with fevers, coughs and colds, particularly during the RSV season
  • If your child is at high risk, try to avoid crowded  areas
  • Washing toys used by children who have symptoms of a cold – viruses can live on the surfaces of tables and toys for several hours
  • Discourage other people from kissing your baby
  • Not exposing your baby to a smoky environment from cigarettes, either in your home or outside 

Why are premature babies most at risk for RSV infection?

Pre-term infants are at the highest risk for serious RSV infection and related hospitalisation. Premature infants have underdeveloped lungs, which can be a contributing factor to increased risk for RSV disease and cardiopulmonary complications. 

Infants with a congenital heart disease (structural or functional defect in the heart that is present at birth) or a chronic lung disease are also at increased risk of developing severe RSV disease, hospitalisation and death. 

Other risk factors for severe RSV disease include low birth rate (less than 2500 grams) and a compromised immune system. 

Other contributing factors are exposure to tobacco smoke, having school-age siblings, attending day care and living in crowded conditions. 

If my little one gets RSV will my baby need to be admitted to hospital?

This will depend on how badly your baby is affected by the virus. The reason babies with RSV are admitted to hospital is because of increased breathing difficulties. Infants, being unable to breath, will not feed and result in dangerous dehydration, which is the principle reason for admission to Paediatric Intensive Care Units (PICU). 

As the virus progresses through the lung, the lung tissue inflames and sloughs off and blocks airways, leading to wheezing and respiratory distress. In some very severe cases this means the infants need to be put on ventilation machines, sometimes for days at a time. 

If my baby has already had RSV can they be infected again?

Unfortunately being infected once does not protect your baby from becoming infected again with RSV. 

Are there any long-term effects from getting RSV as an infant?

Some babies with RSV continue to have recurrent respiratory symptoms throughout childhood. It is estimated that, of all the babies admitted to hospital with the disease, 30% will still suffer recurrent wheezing episodes 10 years later. Some may develop into asthma. 

Is there anything else I can do to prevent my baby from getting RSV?

There is no vaccination against RSV. One medicine has been registered to prevent serious lower respiratory tract disease in children at high risk of severe RSV infection. This medication is called palivizumab. However, the medication is very costly and its use in the public health sector may be reserved for only very high-risk infants and children. 

You should talk with your doctor to obtain further information about treatment available. 

This fact sheet is a general information sheet only and is not intended to replace medical care and/or advice. Please see your doctor if you have further questions.

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