Parents living in London have been told to ensure their children are fully immunised against polio after traces of the disease were found in the capital’s sewage system.
The news comes just two weeks after the World Health Organization (W.H.O.) observed coronavirus vaccination infrastructure should stay in place to ensure other diseases such as polio can be countered in the future.
The UK Health Security Agency (UKHSA) says it was probably imported to London by someone who was recently vaccinated overseas with a live form of the virus, the BBC reports.
It says the risk is low, but parents should still check the immunisation status of children to ensure they are fully up-to-date.
“Most of the UK population will be protected from vaccination in childhood, but in some communities with low vaccine coverage, individuals may remain at risk,” said Dr Vanessa Saliba, consultant epidemiologist at UKHSA.
Over the past four months, the UKHSA has found the polio virus in samples collected from the Beckton sewage works, which serves a population of four million in north and east London.
The UKHSA stressed the virus has only been detected in sewage samples and no cases of paralysis have been reported.
An inactivated polio vaccine is used in the UK as part of the routine childhood programme.
According to the National Health Service (NHS), it is given three times before the age of one, and then again at three and 14 years of age.
Take-up of the first three doses is about 86 percent in London, well below target levels, with the rest of the UK over 90 percent.
Health authorities have now declared a national incident and informed the W.H.O. of the situation.
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