In an extraordinary time, British health authorities are taking extraordinary measures to beat back Covid-19. But some experts say that, in doing so, they are also taking a serious gamble.
In recent days, the British have said they will stretch out the interval between the administration of the two doses required for Covid-19 vaccines already in use — potentially to as long as three months, instead of the recommended three or four weeks. And they have said they will permit the first dose and second dose for any one person to be from different vaccine manufacturers, if the matching vaccine is not available.
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