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Promising findings from an initial trial of the Oxford vaccine for covid-19 have been published in The Lancet but many questions remain about whether the vaccine would work

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91É«ÇéƬ

Humans

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91É«ÇéƬ

Some countries have all but eliminated the virus, in others it is surging and some are seeing a second wave. What can we learn from the best – and worst – strategies?

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