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26th October 2023
11:38am BST
The virus is one of the main contributors of bronchiolitis and pneumonia in very young children, and is usually more widespread in winter and early spring, according to the HSE.
While RSV is not new and most children will have gotten it by the time they turn two, it can be more serious in babies under one year, children aged one to four, and anyone with an underlying lung or heart condition.
Symptoms of RSV are mostly mild and resemble a cold. These include a runny nose, coughing, and sneezing, and recovery time is usually between two and three weeks without treatment or needing to see your GP.
Other symptoms include difficulty feeding or decreased appetite, fever (temperature of 38 degrees celsius or higher), and a sore throat.
These symptoms usually will occur in stages and not all at once.
After four to five days, babies and young children may develop bronchiolitis, which may worsen their symptoms and often last three to four days before they feel better.
They may present as increased breathing (more breaths per minute), wheezing, difficulty feeding or decreased appetite, or less wet nappies.
It can last anywhere between 10 and 14 days before babies and young children recovered from an RSV infection, according to the HSE.
They also advise that many babies and children could have a cough that lasts for weeks after the infection begins, but it does not require antibiotics.
The HSE states that the symptoms of RSV can usually be treated at home and without the need to see a GP.
However, there are a number of instances when you should call 999 or 112 or go to your nearest emergency department with your child:
