Though questions remain that still need answering, there are encouraging signs that proof of immunity to Covid-19 could help people return to normality
As the world’s biggest ever vaccination programme gets underway, so-called immunity passports are back in the headlines. A document verifying the holder’s status as Covid-free could allow international borders as well as concerts and other events to reopen.
So are immunity passports just the ticket, or do they remain a flight of fancy?
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