Data indicates flu vaccine prevented around 100,000 hospital admissions

June 3, 2025

New data published today by the UK Health Security Agency (UKHSA) shows that the flu vaccine is estimated to have prevented around 96,000 to 120,000 people from being hospitalised in England last winter.
The figures are encouraging, but immunisation experts say that many more could have been protected if more eligible people took up the free flu vaccine. UKHSA’s annual figures published today show contrasting influenza vaccine uptake rates for 2024/25 across eligible groups during a season of high flu levels.
While today’s annual influenza reports show there were some successes on the delivery of the NHS routine flu programme among the eligible groups, of concern were the decline in uptake among:
• 2 to 3 year olds (41.7% & 43.5%) compared with 44.1% and 44.6% in the previous season. The most recent seasons figures are also below that seen pre-COVID-19 pandemic 2019-20 (43.4% & 44.2%)
• Primary school children (54.5%) compared with pre-pandemic levels in 2019-20 (60.4%)
• People with long term health conditions and/or who are immunosuppressed (40.0%) compared with pre-pandemic (44.9%) 2019-20
However, the figures show record uptake rates among secondary school children (44.6%) – the highest since the secondary schools’ programme was introduced in years 7 to 11, with UKHSA officials urging for a further increase in coming flu seasons.
High flu vaccine uptake was seen once again in those aged 65 and over (74.9%) – just fractionally short of the World Health Organization 75% target.
The 2024/25 flu season saw high levels of flu activity with significant impact on the NHS. Report shows:
• The cumulative hospital admission rate was 139.5 per 100,000. This was higher than in both the 2023 to 2024 season (77.5 per 100,000) and (94.2 per 100,000) in the 2022 to 2023 season.
• For excess mortality, there were 7,757 deaths this winter. This is higher than the 3,555 deaths recorded last year but lower than the 2022-23 season (15,867 deaths).
• Estimated vaccine effectiveness against primary care influenza attendances ranged from 35% (adults aged 65 and above) to 55% in children.
• Against hospitalisation, vaccine effectiveness ranged from 38% in adults aged 65 and above to 75% in children aged 2 to 17 years of age.
Dr Suzanna McDonald, National Lead for the Influenza programme at UKHSA said:
“Our flu reports for last winter show a mixed picture with some successes but also some concerning falls in vaccine uptake.
“Uptake among secondary school children was at a record high and in the older age group, 65 and over, we almost achieved the World Health Organization 75% target. But many of the more vulnerable who are eligible – young infants, primary school children and people with a long-term health condition and the immunosuppressed – did not get their vaccine, with worryingly low uptakes.
“Last winter was a bad flu season, but estimates show vaccination protected as many as 120,200 from being hospitalised. But for many thousands of unvaccinated vulnerable children and adults who ended up seriously ill in hospital, this could have been prevented.”
Minister for Public Health and Prevention Ashley Dalton said:
“Getting the flu vaccine is vital to protect both you and your family from serious illness — ultimately saving lives and easing pressure on our health system.
“I encourage anyone who is eligible to book their appointment as soon as the vaccination programme restarts in the autumn.
“This vaccination programme plays a crucial role as we shift the health service from sickness to prevention under our Plan for Change.”
Caroline Temmink, NHS England Director of Vaccination, said:
“NHS staff have worked incredibly hard to step up the flu vaccination campaign and protect as many people as possible, delivering over a quarter of a million more flu jabs with record rates among secondary school pupils and high uptake achieved again in those aged 65 and over.
“We know there are still too many eligible people who aren’t getting vaccinated and protecting young ones will not only protect them but the whole family. Vaccination remains our strongest defence against flu and that’s why our upcoming Urgent and Emergency Care Plan will include targeted initiatives to boost vaccine uptake – with a focus on healthcare workers, those most vulnerable and children.”
The number of frontline healthcare workers receiving a flu vaccine this season was 37.8%. Although this can’t be directly compared to previous seasons due to different timings of this season’s occupational health offer, the previous season saw uptake of 43.1%.
The initial rise in flu activity this season was driven by influenza A(H1N1) in children and later increased in elderly age groups. There was limited influenza A(H3N2) activity recorded.
Influenza B activity started to increase in January 2025 in younger age groups and peaked across nations between mid-February and early March but with limited activity in elderly age groups.