All children aged one to nine and living in Greater London will be offered a polio vaccine after the virus was detected in sewage.
The virus, which can cause paralysis, has been found 116 times in London's wastewater since February.
The urgent immunisation campaign will see nearly a million children offered the vaccine - including those already up to date with their jabs.
Parents and carers will be contacted by their GP within the next month.
Polio is seen as a disease of the past in the UK after the whole of Europe was declared polio-free in 2003.
Dr Vanessa Saliba, a consultant epidemiologist at UKHSA, said: "All children aged one to nine years in London need to have a dose of polio vaccine now - whether it's an extra booster dose or just to catch up with their routine vaccinations."
She said the risk for the majority of the population who are vaccinated remains "low" but said it was "vital" parents ensure their children are fully vaccinated.
Source: BBC News, 10 August 2022
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