A dramatic breakthrough in the race for a Covid vaccine has been announced. Now what? An unprecedented logistical effort unfolds. How effective are all these new vaccines? What goes on behind the scenes as they are manufactured, distributed, injected? Who should get priority – and who will get priority? And what about the people who mistrust the very idea? Tim Harford will be searching for answers to these and other questions in the defining story of the pandemic in the new series: How To Vaccinate The World.

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Tim Harford introduces his new guide to the race to create a Covid-19 vaccine.