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Now that scientists have created a Covid-19 vaccine in record time, the race is on to vaccinate the world. Public health professor Devi Sridhar follows the journey of the Covid vaccine from factory to arm as she goes behind the scenes of the rollout. Speaking to health leaders, politicians and experts, we see how the world is responding and look at how long it might take to vaccinate enough people. The challenges facing companies, governments and NGOs might be political and economic – but as the virus continues to spread, the race is really against time.

(Photo: A registered nurse administers the Covid-19 vaccine into the arm of a woman. Credit: Frederic J Brown/AFP/Getty Images)