US President Joe Biden has announced ambitious fresh targets for vaccinating Americans against the coronavirus, even as vaccination rates slip and persistent new variants take hold.
Experts have warned that the mission to reach “herd immunity” is unrealistic, amid ideological divisions over the value of vaccines.
The U.S. president is doubling down, insisting 70 per cent of Americans will receive their first shot by July 4th.
Nina-Maria Potts has more:
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