South Africa's decision to halt its rollout of the Oxford-AstraZeneca vaccine after a study showed "disappointing" results against its new Covid-19 variant may have left the nation in shock, but it also shows how scientists are at the forefront of the battle against coronavirus.
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Moderna's vaccine is safe and 94% effective, regulators say, clearing the way for US emergency authorisation.
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Critical care nurse Sandra Lindsay in New York became one of the first Americans to receive the coronavirus vaccine this morning.
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A 90-year-old woman has become the first patient in the world to receive the Pfizer Covid-19 vaccine after its approval in the UK, where the NHS has launched its biggest vaccine campaign.
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The first effective coronavirus vaccine can prevent more than 90% of people from getting Covid-19, a preliminary analysis shows.
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