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A vaccine for Covid-19 could be ready within a year if trials go well, a leading UK research scientist has sad.

Professor Robin Shattock, who leads a team working to produce a vaccine at Imperial College London, said that enough of the vaccine would be available for every person in the UK if trials go 'really well'.

There is no certainty that the vaccine being developed with work though as its effectiveness depends on the level of immunity needed to prevent infection, which makes chances of success difficult to predict.