RSV can cause serious chest infections in young babies. The HSE offers free immunisation to eligible babies to help protect them during the autumn and winter months. Here is what to expect for the 2026–2027 RSV season.

What is RSV?

Respiratory syncytial virus, or RSV, is a common virus that can cause cold-like symptoms such as a runny nose and cough. In babies, it can sometimes lead to bronchiolitis or pneumonia. Young babies are at greater risk of becoming seriously unwell.

Is the RSV injection a vaccine?

Parents often call it the “RSV vaccine”, but the injection currently offered to babies through the HSE is an immunisation called nirsevimab, not a vaccine. It gives babies protective antibodies directly, so it starts working straight away. One injection into the thigh provides protection against severe RSV illness for about five months.

Which babies can get free RSV immunisation?

For the 2026–2027 season, the HSE offers free RSV immunisation to:

• Babies born from 1 September 2026 to 28 February 2027
• Babies born from 1 March to 31 August 2026
• Some babies under 24 months who are at higher risk of severe RSV illness

If your baby is born between September and February, you will be offered the immunisation in the maternity hospital soon after birth. If your baby was born between March and August 2026, you can arrange an appointment through your GP practice. Parents of a baby who may be at higher risk should speak to their paediatrician.

Is RSV immunisation safe?

Most babies have no side effects. Fewer than 1 in 100 have mild effects such as redness at the injection site, a temperature or a rash. Serious allergic reactions are very rare, and your baby will be monitored for 15 minutes after the injection.

Your baby can receive RSV immunisation at the same time as routine childhood vaccines. The HSE says nirsevimab prevents more than 80% of RSV hospitalisations. It reduces the risk of severe illness, but babies can still catch RSV, so it remains important to watch for symptoms.

When should I get medical help for my baby?

RSV may begin like a cold. Contact your GP if your baby is feeding poorly, has fewer wet nappies, seems short of breath, or you are worried about them. Seek urgent medical advice if a baby with RSV symptoms is under two months old, was born prematurely, or has a heart, lung or immune condition.

Call 999 or 112, or go to an emergency department, if your baby is visibly struggling to breathe, has blue lips or tongue, cannot stay awake, has pauses in breathing, or has had a dry nappy for 12 hours or more. Trust your instincts if your baby seems seriously unwell.

Where can I find out more?

Read the HSE’s RSV immunisation guidance for babies for current eligibility and arrangements. If you are unsure whether your baby should receive the immunisation, speak to your midwife, GP or paediatrician.