When will the world have vaccinated 80% of all adults, the level presumed by scientists to produce herd immunity against Covid-19? Most people’s answer is 2023 or 2024, which suggests deep pessimism about the progress of vaccinations outside the rich world. That is also why pledges at the recent G7 summit to donate one billion doses to poor countries during this year and in 2022 look to some like generous game-changers.

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