A major measles outbreak in London, revealing over 300 suspected cases, has emerged as the stark consequence of the UK’s recent loss of its hard-won measles elimination status, according to internal health documents and official data.
The World Health Organization confirmed on 26 January 2026 that the UK no longer had endemic measles transmission under control, a status it had first achieved in 2016 and regained in 2021. This decline follows a severe resurgence, with 2,911 laboratory-confirmed cases in England during 2024—the highest number since 2012—followed by 959 cases in 2025.
An internal UK Health Security Agency report, marked “official sensitive” and seen by The Independent, details the acute current crisis. It shows 340 suspected measles cases in the capital since the start of the year, with 123 of those confirmed. A single school in Enfield, north London, has been an epicentre, accounting for 34 confirmed cases between 20 January and 7 February alone.
Public UKHSA figures indicate that, as of 23 February, there have been 158 laboratory-confirmed measles cases in England since 1 January 2026. London accounts for 66% of this national total, or 104 cases, with the West Midlands making up 21%. Enfield has been hardest hit, with 59 confirmed cases so far this year—the highest of any local authority area nationally—while neighbouring Haringey has reported 12.
A Crisis of Vaccination
The driving force behind the outbreak is a precipitous decline in vaccine uptake, falling far below the 95% coverage the WHO recommends to achieve herd immunity. In 2024-25, only 84.4% of UK children received both doses of the measles, mumps, and rubella (MMR) vaccine. Coverage in London is critically low, with some boroughs reporting that just over half of five-year-olds are fully protected: rates were as low as 51.3% in Kensington and Chelsea, 52.9% in Hackney, and 53.7% in Hammersmith and Fulham.
In Enfield, where the current outbreak is most intense, only 64.3% of five-year-olds had received both MMR doses in 2024-25. Nationally, the uptake of the second MMR dose among five-year-olds in England was 83.7% last year, its lowest level in over a decade. From 1 January 2026, the combined MMRV vaccine, which also protects against varicella (chickenpox), replaced the MMR jab in the routine childhood programme.
The internal UKHSA data underscores the link between infection and low vaccination. For cases between January 2025 and February 2026, 78% of infected children aged one to four were unvaccinated, alongside 90% of cases in children aged five to 11. Research from 2022 indicated that “hotspots” of low MMR vaccination were clustered in London’s most deprived neighbourhoods, a pattern reflected in the current outbreak where 42 cases over a recent period were in children living in the capital’s most deprived areas.
Children Bearing the Burden
The disease is disproportionately affecting young children. The majority of cases detected in London between 27 January and 24 February were in children aged one to four, with 37 confirmed cases in that age group and 22 in children aged 5 to 11. More broadly, 75% of confirmed infections in England since the start of 2026 have been in children under the age of ten.
Measles is a highly infectious disease that can lead to severe complications. According to health experts, about one in five unvaccinated individuals who contract measles requires hospitalisation, and all hospitalised cases in the current outbreak have involved unvaccinated children. Complications include pneumonia—the most common cause of measles death in young children, occurring in up to 1 in 20 cases—as well as meningitis, blindness, and seizures.
Encephalitis, a swelling of the brain, occurs in about one in every 1,000 measles infections and can lead to lasting brain damage, deafness, or intellectual disability. Tragically, nearly one to three of every 1,000 children infected with measles die from respiratory and neurological complications. A child died with measles in Liverpool last year.
Public Health Mobilisation
Health authorities are intensifying efforts to curb the outbreak. Dr Yimmy Chow, London region deputy director for the UK Health Security Agency, warned: “The measles outbreak in north London continues and while children remain unvaccinated, the risk of it spreading to other areas remains a real threat… With a disease as infectious as measles, it will find those unvaccinated.”
The NHS response includes GP practices proactively contacting unvaccinated patients and offering additional appointments, including out-of-hours clinics. Temporary vaccination clinics are being held in schools and community settings as part of a government campaign, “Stay Strong, Get Vaccinated,” aimed at encouraging routine childhood immunisations. Catch-up campaigns are also targeting older children and adults who missed doses.
Dr Josephine Sauvage, a local GP and chief medical officer of the North Central London Integrated Care Board, stated: “It is obviously concerning that cases are still rising, but there is something we can all do… which is to get the vaccine. The vaccine is proven over decades to be safe, effective and the best way to protect your child.” Changes to the GP contract for 2026-2027 include improvement incentives for practices making progress in vaccination rates.
Separate UKHSA data tracking a longer period shows the scale of the resurgence: between 1 January 2024 and 23 February 2026, there have been 1,117 measles cases in England, with 597 in London, 141 in the North West and 109 in the West Midlands.
Experts point to a combination of vaccine hesitancy, fuelled by online misinformation, and entrenched health inequalities as key factors behind the low uptake. The UK’s struggle mirrors a global trend, with measles cases increasing worldwide since 2022 and countries like Canada and the US also facing challenges to their elimination status.
