A form of polio derived from the vaccine is likely circulating in the UK, highlighting the ongoing need for polio vaccination worldwide.
Polio samples were found in sewage in east London, less than 10 miles from the Tower of London , lit in purple to mark World Polio Day last October.United Kingdom health officials are urging people to make sure they are vaccinated against polio, after several sewage samples in London tested positive for the poliovirus towards the end of June.
The last case of wild polio contracted in the United Kingdom was in 1984, and the country was declared polio-free in 2003, but the virus still circulates in some parts of the world.Why is there polio circulating in London sewers? Children are routinely vaccinated against polio. According to the World Health Organization Global Polio Eradication Initiative , 86% of people in London are vaccinated against polio. However, a drop in vaccination uptake during the COVID-19 pandemic could allow the virus to keep circulating. A report this year by the UKHSA found that, in parts of west London, only 35% of teenagers had received their polio booster in 2020–21.
Since 2021, however, the number of vaccine-derived polio cases has been declining. In the past year, 18 countries
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