April 28, 2021 An 1802 engraving shows a doctor, possibly Edward Jenner, with a “victim” of his vaccine. They are surrounded by the already vaccinated, who exhibit some worrying cow-related side effects.Credit...James Gillray, via Historica Graphica Collection/Heritage Images, via Getty Images By David Motadel Mr. Motadel is a historian at the London School of Economics and Political Science. LONDON — Almost 14 months into the coronavirus pandemic, vaccines are, for most of us, the key to getting out of lockdown and returning to lives that we recognize. And with more than a billion doses administered worldwide, there are reasons for hope — even if that hope is not spread evenly.