But speaking to The Daily Telegraph, Professor Dame Sarah Gilbert said immunity is"lasting well" for most people who have been double jabbed, and she suggested surplus doses should instead be redirected to countries where vaccination rates are low.
She added:"As the virus spreads between people, it mutates and adapts and evolves, like the Delta variant.Dame Sarah also called on the UK to"do better" in supporting countries where a small percentage of the population have received a jab - adding that"the first dose has the most impact".
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