The FT's Kiran Stacey explains why there has been a steep drop in the number of Americans getting vaccinated and what President Joe Biden is doing to reverse the trend — and reach his target of having 70 per cent of all adults protected by July 4. See if you get the FT for free as a student (http://ft.com/schoolsarefree) or start a £1 trial: https://subs.ft.com/spa3_trial?segmentId=3d4ba81b-96bb-cef0-9ece-29efd6ef2132


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