The UK's mass vaccination roll-out is one of the fastest and most successful in the world. It relies heavily on supplies of the Oxford-AstraZeneca vaccine, after the government ordered 100 million doses. (Subscribe: [ Ссылка ])
And so far, the UK has not joined a number of other countries which have stopped the jab for younger people - amid concerns about whether it could increase the risk of a rare blood clot, especially in younger women.
This programme has now learned that the UK's medicines regulator is being urged to change tack - possibly this week.
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