Pollard, who heads the Oxford Vaccine Group, said that a decision to boost should be based on scientific studies. There had not been any evidence yet of an increase in severe disease or deaths among the fully vaccinated.
Britain has given two doses of vaccine to three-quarters of adults. The World Health Organisation (WHO) has urged countries that are planning booster programs to delay them until more people are vaccinated around the world.
Pollard said that vaccine supplies would be better used to protect vulnerable people in other countries.
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