The virus causes more than 20,000 babies in the UK to be seriously ill in hospital every year.
Baby hospital admissions have been seen to plummet in the UK thanks to a vaccine that is given to expecting mothers during pregnancy. This vaccine helps protect newborns from a nasty chest infection that can leave them grasping for breath and unable to feed.
According to new reports from UK health officials, this maternal vaccine has cut hospital admissions for RSV by more than 80 per cent. Since it was launched in 2024, women are offered the vaccine from 28 weeks of pregnancy to help protect their child.
RSV (respiratory syncytial virus) affects many newborns in the first few months of life and causes a chest infection that can lead to the baby becoming seriously ill. Data has shown that this virus has led to more than 20,000 babies in the UK being admitted to hospital each year due to nasty symptoms.
This virus is one of the main reasons babies are admitted to hospital before the age of one, with half of newborns catching RSV. According to the UK Health Security Agency (UKHSA), a new study of the vaccine’s impact shows that it gives “excellent protection” to babies that are the most vulnerable to the virus.
Symptoms of the virus can vary from a mild cold to a life-threatening chest-infection due to inflammation in the lungs. Each year, a small number of babies die from RSV.
The vaccine was first introduced in the UK in 2024 after clinical trials found it would boost a pregnant woman’s immune system enough to pass the protection through the placenta to the baby. This means the babies are born vaccinated from the virus.
The study found that if the vaccine is given at least four weeks before the baby is born then the protection is nearly 85 per cent. However, it does say that some protection is still possible if the jab is given even closer to the due date.
In fact, the study shows that even a two-week gap between vaccination and birth can be long enough to protect babies born earlier than planned, reports the BBC.
However Dr Conall Watson, national programme lead for RSV at the UK Health Security Agency, stresses that getting the vaccine as early as possible will offer the greatest protection for newborns.
He said: “If you’ve got a longer interval between when the vaccine gets given and when the baby is born, then you get even better protection. Get it on time. But if you can’t, do get vaccinated all the way through the third trimester.”
From August 1, 2024, to May 2025, a total of 17,911 doses of the RSV vaccine were administered to pregnant women in Scotland, which is an uptake of 49.1 per cent.
RSV is most common during the winter months, but it can occur at any time of the year. Along with this medication, pregnant women can receive vaccines for the flu and whooping cough through the NHS.
Dr Watson adds: “I would strongly encourage any pregnant woman to discuss it with their midwife, other health professionals, and be ready to have the vaccine at their week 28 appointment, or another vaccine appointment arranged soon after that.”
In the study, which followed nearly 300,000 babies born between September 2024 and March 2025 in England, more than 4,500 babies were admitted to hospital. The vast majority of these cases were of babies whose mothers did not receive the vaccination.
The RSV vaccine can also be given to people aged 75 and over, as well as for those who live in a care home with older adults.

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