What's driving measles outbreaks in London?

Why infections are rising and what public health officials are doing

Officials in parts of the capital have reported a rapid increase in confirmed cases, mostly among young children. Health authorities say the surge is concentrated in communities with low childhood immunization coverage; many of the infections have been in unvaccinated or under‑vaccinated children, and some patients required hospital care.

Public health actions underway include intensified vaccination drives, checks at schools and nurseries, and guidance that close contacts who are not fully immunized may be excluded from school settings for a period to limit spread. Local health bodies and national agencies have urged parents to check children’s immunization records and get the measles‑mumps‑rubella (MMR) vaccine if shots are missing.

What to know and watch for

• Symptoms commonly begin with fever, runny nose and cough followed by a characteristic rash; measles can cause complications such as pneumonia and encephalitis.
• Young children, infants too young to be vaccinated and people with weakened immune systems are at higher risk of severe disease.
• Simple steps—checking vaccine status, arranging catch‑up MMR doses, and keeping sick children away from group settings—reduce transmission.

Why this matters beyond the city

Measles is highly contagious and outbreaks can spread quickly when community immunity falls. Rising case counts in schools and universities have prompted warnings that national elimination goals could be jeopardized if coverage does not improve. Health leaders stress that increasing vaccination access and reversing hesitancy are the most effective ways to control current outbreaks and prevent future ones.