Britain may have closed its doors to visitors who test positive for the coronavirus, but much of the rest of the world is already looking forward to a happier future of unrestricted travel for those who have received their vaccines.

When the idea of coronavirus “immunity passports” was first raised in Downing Street last April, many scientists expressed caution at schemes that might exempt recipients from lockdown measures.

It was partly because little was then known about the strength and duration of immunity conferred by exposure to the virus. There were also serious doubts about the discriminatory effects of dividing the nation into those presumed to be immune and those still vulnerable — the infected and the uninfected, the jabbed and the unjabbed.

Nine months

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