Updated on Tuesday, 9 February 2021 - 07:58

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Some countries like the

United Kingdom

are delaying the administration of the second dose of the coronavirus vaccine for at least two reasons: the pressure of the large increase in positives, which pushes to immunize more people at least once, and the shortage of available dose, which requires decision-making It is true that even a single dose of the vaccines licensed in






) offers a certain threshold of protection against


, but no studies have been conducted so

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