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Thabisle Khlatshwayo in South Africa receives her first shot for a covid-19 vaccine trial

Jerome Delay/AP/Shutterstock

To understand how unequally covid-19 vaccines are being rolled out around the world, look to Guinea. The World Health Organization says the West African state has administered just 25 doses. By comparison, more than 39 million have been given in high-income countries, with more than 7 million in the UK alone.

The reality is that while the EU tussles with AstraZeneca over vaccine supplies and the US government weighs up how many millions of people should be vaccinated daily, many middle-income countries …