By Jennifer Rigby LONDON (Reuters) – Poliovirus has been detected in sewage samples in the British capital, the first sign since the 1980s that the virus could be spreading in the country, but no cases have been found, authorities said. The risk of infection from the disease, which causes paralysis in children in under 1% of cases, was also low because of high vaccination rates, the UK Health Security Agency (UKHSA) said. The agency nevertheless encouraged parents to make sure their children were vaccinated after the discovery of the virus during routine wastewater surveillance – particularly …

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