Here's what we do know
, which the company says is a "standard protocol measure" appearing on any drug trial in case it should contain a live component.
The weakened virus in the live vaccine is extremely unlikely to cause any problems. The concern is it might - over time as it is passed from person to person - become more like the original wild polio virus that causes disease.It is generally only in under-vaccinated populations that it spreads for long enough periods to evolve in worrying ways, Prof Paul Hunter, a public health and infectious diseases specialist at the University of East Anglia, explains.
London has lower vaccination rates than the national average - especially in certain areas - and experts believe this may have allowed the weakened version of the virus from the vaccine to spread and evolve.She acknowledged it might be confusing to some people that a vaccine was the solution to tackling a strain of polio that came from a vaccine.
Remember, the jab given in the UK - which health leaders are recommending people check they are up-to-date with - is not live and cannot infect anyone.It's become a regular tactic from some accounts and social media groups to jump on any news of illness and link it to Covid vaccines.
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