Vaccinating 70 per cent of the population in every country in the world against Covid-19 by mid-2022 has been the World Health Organisation's (WHO) rallying cry to end the pandemic.

But recently, public health experts say that while boosting immunity globally remains essential, the figure is neither achievable nor meaningful.

It has always been ambitious: Currently, just 12pc of people in low-income nations have had one shot, according to Our World In Data. Earlier targets set by WHO — to reach 10pc by September 2021, for example — were also missed.

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