A confidential internal report from the UK Health Security Agency (UKHSA) has been leaked, confirming a significant measles outbreak in London with 340 suspected cases recorded since the beginning of 2026. This alarming disclosure highlights a growing public health crisis in the capital, driven by low vaccination uptake among children.
Details of the Measles Outbreak in London
The leaked document provides specific data on the outbreak, revealing that 123 of the 340 suspected cases have been officially confirmed. Among these, a cluster of 34 confirmed measles cases was traced to a single school in Enfield, north London, occurring between 20 January and 7 February 2026. The majority of the confirmed cases involve children aged one to four years old, with 42 cases identified in children from the most deprived areas, underscoring health inequalities in the region.
National Context and Elimination Status
Between January 2024 and February 2026, England has recorded a total of 1,117 measles cases, with London accounting for 597 of these. This surge has contributed to the UK losing its measles elimination status, a setback that health officials attribute to declining vaccination rates. The MMRV vaccine, which protects against measles, mumps, rubella, and varicella, has seen particularly low uptake in areas such as Hackney and Enfield, exacerbating the spread of the virus.
Health Officials' Response and Urgent Calls for Action
In response to the outbreak, health authorities are urgently advising parents to ensure their children receive the MMRV vaccine. The leaked report emphasizes that vaccination is critical to controlling the outbreak and preventing further cases. Public health campaigns are being intensified in high-risk areas to address misinformation and barriers to vaccination, aiming to restore herd immunity and protect vulnerable populations.
The situation in London serves as a stark reminder of the importance of maintaining high vaccination coverage to prevent the resurgence of preventable diseases like measles. As the outbreak continues to unfold, ongoing monitoring and community engagement will be essential to mitigate its impact and safeguard public health.
