People infected with polio in the UK are probably oblivious to it - but if allowed to spread it could eventually reach an unvaccinated child, an expert has warned.
Health chiefs are scrambling to identify where the poliovirus is circulating, with the UK Health Security Agency (UKHSA) today declaring a 'national incident' after it was detected in sewage works in London.
The samples were found at the London Beckton Sewage Works, which serves four million people in the capital.
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