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Vaccines versus variants: will the world ever reach herd immunity?

New strains and persistent hesitancy to take jabs are complicating government plans to reopen economies

In Ohio, anyone getting a Covid vaccine could win one of five lottery prizes of $1m. New Jersey residents getting the jab are being offered free beers. One site in New York boasted an even more unlikely incentive: a courtesy marijuana joint.

Since the start of the year, America has successfully ramped up its vaccine campaign so that more than 160m people have had at least one shot so far — already meeting the target President Joe Biden had set for July 4.

But if children are included, that is still less than half of the population and in some parts of the country the take-up of vaccines has started to slow. As a result, states and businesses are turning to unorthodox incentives to try to persuade the vaccine hesitant to have a jab.

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