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What’s the scientific basis for delaying the Covid vaccine second dose?

UK health officials also allowing combining doses from different manufacturers

UK health officials have decided to delay giving second doses of Covid-19 vaccines and even permit combining doses from different manufacturers, prompting international concern. What is the scientific justification for this decision?

Why has the UK decided to lengthen the gap between the first and second doses of vaccine?
The original plan was to offer priority groups an initial shot of vaccine, followed by a second dose three weeks later. But a rapid increase in the number of Covid-19 cases, combined with the emergence of a more transmissible variant and uncertainty about the supply of vaccine stocks, prompted the Joint Committee on Vaccination and Immunisation (JCVI) to consider other options.

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Read the original article at The Guardian

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