Covid-19 vaccination: What’s the evidence for extending the dosing interval?

@article{Iacobucci2021Covid19VW,
  title={Covid-19 vaccination: What’s the evidence for extending the dosing interval?},
  author={Gareth Iacobucci and Elisabeth Mahase},
  journal={BMJ},
  year={2021},
  volume={372}
}
On 30 December the four UK chief medical officers announced that the second doses of the covid vaccines should be given towards the end of 12 weeks rather than in the previously recommended 3-4 weeks. Gareth Iacobucci and Elisabeth Mahase look at the questions this has raised 

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