Millions of South Africans have been clamouring to get vaccinated over the past few months — and yet some countries are having to dream up increasingly creative ways to lure people into getting their jabs.

In the US, most of those who want vaccines have had them, and yet only 48% of the population (161-million people) are vaccinated. This is some way off the 80% proportion that the New England Journal of Medicine this month estimated to be the herd immunity target for the US...

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