Polio may be spreading in Britain for first time in 40 YEARS: Strain of paralysis-causing virus mutated from vaccine is 'likely' being transmitted in London as health chiefs declare 'national incident'

• Officials have found traces of a vaccine-derived poliovirus in sewage samples in North and East London
• Thought that someone vaccinated with live vaccine shed part of virus and spread it to unvaccinated people 
• Parents are being urged to ensure their children's vaccinations are up to date, particularly after the pandemic
• Officials said risk to public 'extremely low' with one in 100 chance of paralysis and high vaccine uptake
• Can I take the polio vaccine if I missed out as a child? What are the virus’ symptoms? How many people are infected in the UK? Read our in-depth Q&A here 

Polio strain mutated from vaccine is 'likely' being transmitted in ...