RSV is a common virus that causes cold-like symptoms. It is very contagious and passes easily between people through hand contact or in droplets produced by coughing and sneezing.
It’s known to infect almost all children by the age of two, and often parents will not know that the colds and sniffles their baby is experiencing are caused by RSV.
Find out about Respiratory Syncytial Virus (RSV), prevention, symptoms, and treatment.
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In the early stages, RSV symptoms are similar to a common cold (runny or blocked nose, cough, sneezing and high temperature).
Symptoms usually last between one and three weeks. If the lungs are affected, one or more of the following symptoms will develop or get worse:
RSV can lead to bronchiolitis and viral pneumonia, which can be serious conditions.
RSV can cause critical illness in babies born premature or sick, and those with underlying medical conditions such as chronic lung disease (also known as bronchopulmonary dysplasia, or BPD) congenital heart disease, and other conditions affecting the immune system.
If the lungs become affected it can lead to breathing difficulties and may require hospital treatment. Risk of severe infection and hospitalisation decreases as your baby gets older.
If your baby was born prematurely, is prone to lung infections or was born with a congenital heart problem, they could be at greater risk of becoming seriously ill if infected with RSV.
Like other seasonal coughs, colds and flu, RSV is usually most prevalent in the UK between October and March each year.
Through the coronavirus (COVID-19) pandemic, restrictions in social contact meant that cases of RSV were reduced.
Since people began mixing again, there has been an increase in cases ahead of the usual seasonal trend, from June, mainly in children aged under five.
A single antibody injection (nirsevimab) which will provide up to six months of protection has been introduced for all babies born before 32 weeks. This will cover their first winter, or RSV season, which runs from October to March.
This replaces the previous palivizumab treatment which required monthly injections.
Babies who are now in their second or more winter season - i.e. babies born and discharged from neonatal care before 1 March 2025 - will not be eligible for this programme.
The immunisation programme will begin in September 2025. If your baby is in the neonatal unit from September 2025, staff will arrange for RSV immunisations to take place before your baby is discharged from hospital.
If your baby was discharged from neonatal care from 1 March 2025 onwards and is eligible for the immunisation you will be contacted to invite you to attend a clinic for your baby to receive the nirsevimab injection.
Eligible babies are those:
If your baby was discharged from 1 March 2025 and you believe they are eligible, but you do not receive an invitation letter to a clinic, you should contact their GP or local neonatal unit.
Currently a single antibody injection nirsevimab is the best protection against severe infection for babies once they are born.
Those who are pregnant are eligible to receive vaccination against their baby being infected with RSV. This can happen after 28 weeks. Speak to your maternity team if you would like to know more about this. There is more information about the RSV vaccine on the NHS website.
RSV is very contagious and passes easily between people via droplets from the nose or mouth. It can survive on surfaces for up to 24 hours.
Practice good hygiene by washing hands regularly, discourage adults and children with cold-like symptoms from handling, kissing and cuddling your baby, and try to reduce your baby’s exposure to crowds and public transport.
Previous infection does not provide immunity, meaning that your child can get RSV again even if they’ve had it before.
RSV is more likely to spread where there are groups of young children, for example in nurseries, playgroups and schools, and in babies with preschool-age siblings.
Exclusive breastfeeding reduces the risk of severe infection and hospitalisation with RSV. If you would like to breastfeed and need support, speak with healthcare professionals who will be able to help.
If your baby is in the neonatal unit and you are not able to breastfeed them, you may want to express your milk.
This can be fed to your baby through a tube into their tummy, giving them the benefits of breast milk. Visit our pages on feeding for more information.
Smoking or allowing others to smoke near your baby increases their risk of hospitalisation with RSV.
The NHS runs free stop smoking services that can support you or members of your household to quit smoking.
The risk of hospitalisation due to an RSV infection is greatest in the first few months of life. Being infected again is common and can occur at any age, but symptoms are usually less severe.
If you are concerned, speak with a GP, neonatal staff or another healthcare professional, such as a health visitor or community nurse.
They will be able to tell you if your child is in the at-risk category and therefore qualifies for preventative treatment.
Babies who show any of the following symptoms should be taken to hospital immediately:
If your baby needs to stay in hospital due to an RSV infection, they will be monitored closely. They may be given oxygen support, fluids directly into their veins (IV fluids) and assistance with breathing.
Wheezing that keeps returning, asthma, and other problems with breathing have been seen in children who had hospital treatment for RSV.
Some studies have also shown that children who had a severe RSV infection may be more likely to develop sensitivities to allergens such as pollen or dust mites.
In the first instance, always speak with a healthcare professional such as your neonatal team, your consultant, your GP, health visitor, or community nurse.
If your baby is in the neonatal unit, staff may arrange for RSV immunisations to take place before they are discharged from hospital.
You can also dial 111 or use these out-of-hours services:
Dial 999 immediately if you think your baby might be seriously unwell.
If you have questions about RSV, or anything to do with looking after a sick or premature baby or child, you can email [email protected] and we will be back in touch soon.
If you have a baby on the neonatal unit, or have recently returned home, you can book a video call with one of our Bliss Champions. These experienced volunteers offer emotional and practical support, help you find the right information for you, and offer a listening ear.
Asthma UK and the British Lung Foundation have a helpline and email support service for parents of children concerned about asthma or other lung conditions. More information can be found at the Asthma UK or British Lung Foundation websites.
Information due to be reviewed by September 2028
