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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."

The Medicines and Healthcare products Regulatory Agency (MHRA) on Wednesday (9 January) announced that the novel type 2 oral polio vaccine (nOPV2) has been quality-assured (prequalified) by the World Health Organization (WHO). Developed by a team including scientists from the MHRA, nOPV2 is considered a safer polio vaccine that helps to protect children from the disabling and life-threatening disease and lower the risk of vaccine-derived outbreaks. The vaccine received WHO Emergency Use Listing three years ago, and since then 950 million doses have been delivered worldwide. The UN health agency's decision to add it to the list of prequalified vaccines is based on the analysis of outcomes in vaccinated populations that has confirmed strong safety profile and effectiveness.

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.

The government will on Thursday launch a drive to boost childhood vaccination rates, health authorities said, seeking an "urgent reversal" to a fall in uptake as the country faces a worsening measles outbreak. Routine childhood immunisations in Britain for diseases including measles, mumps and rubella, diphtheria and polio, have been falling gradually over the past decade, but dipped more sharply after the Covid-19 pandemic, mirroring a global decline. Last year UNICEF said people worldwide had lost confidence in the importance of routine childhood vaccines during the pandemic, with misinformation, dwindling trust in governments and political polarisation contributing to rising hesitancy. Britons will begin seeing adverts from next week across various media, including a television campaign featuring children reminding parents of the risk of missing out on vaccinations, the UK Health Security Agency (UKHSA) said. "We need an urgent reversal of the decline in the uptake of childhood vaccinations to protect our communities," UKHSA chief executive Jenny Harries said in a statement.