US experts warn against plan to give different second jab if supplies run low

The UK is setting the pace around the world in the approval and use of Covid vaccines but, while other countries watch intently, not all are yet prepared to embrace what looks like public health pragmatism rather than strict adherence to evidence.

Britain is the first country in the world to approve and use the Oxford/AstraZeneca vaccine, just as it was first with Pfizer/BioNTech’s. In a further trailblazing decision, it is giving everyone a first shot of either of those vaccines, with the second shot delayed to 12 weeks afterwards instead of the three- or four-week interval in the trials.

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