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A polio vaccine booster campaign is being launched for almost a million children in London aged between 1 and 9 after confirmation that poliovirus is spreading in the capital for the first time since the 1980s. The UK Health Security Agency has identified 116 polioviruses from 19 sewage samples this year in London, after first sending an alert about finding the virus in June. The levels of poliovirus found and genetic diversity indicated that transmission was taking place in a number of London boroughs, the agency said on Wednesday (Aug 10). Health secretary Steve Barclay said: "I recognise parents and guardians will be concerned about the detection of polio in London, however I want to reassure people that nobody has been diagnosed with the virus and the risk to the wider population is low… "Vaccines offer the best defence to children, and those around them, so I would encourage families to ensure they are up to date with their routine jabs, and to come forward for the polio booster as soon as they are contacted by the NHS."

Polio has been detected in sewage samples in London, the first sign since the 1980s that the virus could be spreading in the UK, but no cases have been found, authorities said. The risk of infection from the disease, which causes paralysis in children in under one per cent 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 those who may have missed shots during the Covid-19 pandemic. Nationwide vaccination levels are above the 90 per cent needed to prevent outbreaks, but London's coverage rates among the under-twos has dipped below that in recent years. NHS England will begin contacting parents of children under five who are not immunised. Polio, spread mainly through contamination by faecal matter, used to kill and paralyse thousands of children annually worldwide. There is no cure, but vaccination brought the world close to ending the wild, or naturally occurring, form of the disease.