In an effort to ease lockdown restrictions, the UK government is considering issuing immunity passports that show someone can return to work. Supporters of the idea argue that it will help restart the economy, but health experts believe it’s fraught with risks. Chief among their concerns is the testing for immunity. Immunity passports would rely on antibody tests that show someone has recovered from the infection. But scientists still don’t know how long someone remains immune to the coronavirus — or even if they can become immune at all. As the World Health Organization warned in April: There is currently no evidence that people…

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