Recent reports have revealed the presence of the polio virus in London sewage for the second time this year, coinciding with the UK government’s controversial decision to withdraw funding from global polio eradication initiatives. Health advocates have responded with alarm, labelling this move as both “shortsighted” and “self-defeating,” as it potentially heightens the risk of polio spreading within the UK.
Alarming Findings in Sewage Samples
Health officials routinely monitor wastewater from sewage treatment facilities across England for the presence of polio, and the latest detection, reported by the Global Polio Eradication Initiative (GPEI), was based on a sample collected on 2 March. This marks the tenth positive detection of the virus since 2024.
Prof Sir Andrew Pollard, director of the Oxford Vaccine Group, expressed grave concerns regarding the implications of these findings, particularly in areas where vaccination rates are low. “The ongoing detection of poliovirus in sewage samples indicates a real risk of transmission in London,” he stated. “This situation is particularly alarming for communities where vaccination uptake is insufficient, as polio can have devastating consequences.”
Vaccination Rates Decline
While polio has been eradicated in many parts of the world, it continues to exist in isolated regions, notably Afghanistan and Pakistan. The UK has seen a slight decrease in polio vaccination coverage among children in recent years, with the proportion of one-year-olds receiving the full three doses of the vaccine dropping from 95% between 2012 and 2015 to just 92% in 2022-23.
This decline in vaccination rates is particularly concerning given that the form of polio detected in London is a circulating vaccine-derived strain. This variant emerges when the weakened virus from the oral polio vaccine is excreted, mutating in communities with inadequate vaccination, potentially leading to paralysis. In 2025 alone, there were 225 reported cases of polio.
Funding Cuts and Global Health Implications
Last week, the UK government announced significant cuts to international aid, including the cessation of funding for the GPEI, which has historically relied on UK support as its second-largest donor after the United States. These cuts are part of a broader strategy to redirect over £6 billion towards increasing defence spending. However, health experts and campaigners warn that slashing funding for global health initiatives undermines efforts to control infectious diseases that can cross borders.
Adrian Lovett, the UK executive director of the anti-poverty group One, remarked, “The COVID-19 pandemic demonstrated that viruses do not recognise national borders. Our defence against public health threats is contingent upon the health of our global neighbours. The UK government’s decision to reduce international assistance is both morally questionable and perilous for public health at home.”
Local Spread or External Infection?
Dr Kathleen O’Reilly, an associate professor of epidemiology at the London School of Hygiene and Tropical Medicine, noted that while the positive sewage sample is concerning, it remains unclear if this indicates local transmission or is related to a traveller returning from an area where polio is endemic. “It’s essential to highlight that a positive sewage sample does not directly correlate to a paralytic case,” she explained.
The UK Health Security Agency (UKHSA) is collaborating closely with healthcare providers to monitor the situation. Notably, similar detections of polio have been reported in other European nations like Germany, indicating a potential rise in vigilance across the continent.
Why it Matters
The resurgence of polio, even in forms that are vaccine-derived, serves as a stark reminder of the fragility of global health gains. As vaccination rates decline and funding for eradication initiatives is cut, the UK risks not only its own public health but also the broader fight against polio worldwide. The interconnectedness of global health reveals that neglecting international cooperation and support can have dire consequences, making it imperative for nations to prioritise collective health security.
